Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v3.19.2
Fair Value of Financial Instruments (Details Textual)
$ in Millions, $ in Millions
3 Months Ended
Jun. 30, 2018
CAD ($)
Jun. 30, 2018
USD ($)
May 31, 2019
USD ($)
May 31, 2018
USD ($)
Feb. 28, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Payments to acquire investments     $ 20.0 $ 1.5  
Long-term debt, including current portion     12,811.2   $ 12,825.0
Carrying amount [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, including current portion     12,811.2   12,825.0
Fair value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, including current portion     $ 13,199.1   $ 12,768.5
Convertible debt securities [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Payments to acquire investments $ 200.0 $ 150.5