Constellation Brands, Inc. Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details 1)

Fair Value of Financial Instruments (Details 1) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jun. 27, 2019	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018	Feb. 28, 2019
Fair Value, Net Asset (Liability) [Abstract]
Debt securities		$ 1,040.2		$ 1,040.2		$ 3,234.7
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]
Unrealized net gain (loss) on securities measured at fair value		(534.3)	$ (163.9)	(2,200.9)	$ 786.5
Equity securities [Member] \| November 2017 Canopy Investment [Member]
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]
Unrealized net gain (loss) on securities measured at fair value		0.0	(168.5)	0.0	292.5
Warrant [Member] \| November 2017 Canopy Warrants [Member]
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]
Unrealized net gain (loss) on securities measured at fair value		(91.9)	(212.4)	(542.7)	223.5
Warrant [Member] \| November 2018 Canopy Warrants [Member]
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]
Unrealized net gain (loss) on securities measured at fair value			257.6		257.6
Warrant [Member] \| New November 2018 Canopy Warrants [Member]
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]
Unrealized net gain (loss) on securities measured at fair value		(426.8)		(1,561.2)
Warrant [Member] \| New November 2018 Canopy Warrants Modification [Member]
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]
Unrealized net gain (loss) on securities measured at fair value	$ 1,176.0			1,176.0
Convertible debt securities [Member]
Debt and Equity Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment [Abstract]
Unrealized net gain (loss) on securities measured at fair value		(15.6)	$ (40.6)	(97.0)	$ 12.9
Recurring [Member] \| Foreign currency contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		61.1		61.1		38.2
Derivative liability		27.2		27.2		15.7
Recurring [Member] \| Commodity derivative contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		2.7		2.7		8.7
Derivative liability		21.2		21.2		11.6
Recurring [Member] \| Interest rate swap contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative liability		0.6		0.6
Recurring [Member] \| Equity securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities		919.3		919.3		3,023.2
Recurring [Member] \| Convertible debt securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Debt securities		120.9		120.9		211.5
Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Foreign currency contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		0.0		0.0		0.0
Derivative liability		0.0		0.0		0.0
Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Commodity derivative contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		0.0		0.0		0.0
Derivative liability		0.0		0.0		0.0
Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Interest rate swap contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative liability		0.0		0.0
Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Equity securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities		0.0		0.0		0.0
Recurring [Member] \| Quoted Prices in Active Markets (Level 1) [Member] \| Convertible debt securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Debt securities		0.0		0.0		0.0
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Foreign currency contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		61.1		61.1		38.2
Derivative liability		27.2		27.2		15.7
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Commodity derivative contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		2.7		2.7		8.7
Derivative liability		21.2		21.2		11.6
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Interest rate swap contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative liability		0.6		0.6
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Equity securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities		919.3		919.3		3,023.2
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Convertible debt securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Debt securities		120.9		120.9		211.5
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Foreign currency contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		0.0		0.0		0.0
Derivative liability		0.0		0.0		0.0
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Commodity derivative contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative asset		0.0		0.0		0.0
Derivative liability		0.0		0.0		0.0
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Interest rate swap contracts [Member]
Fair Value, Net Asset (Liability) [Abstract]
Derivative liability		0.0		0.0
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Equity securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Equity securities		0.0		0.0		0.0
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Convertible debt securities [Member]
Fair Value, Net Asset (Liability) [Abstract]
Debt securities		$ 0.0		$ 0.0		$ 0.0