Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v3.10.0.1
Fair Value of Financial Instruments (Details Textual)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2018
CAD ($)
Aug. 31, 2018
USD ($)
Jun. 30, 2018
CAD ($)
Jun. 30, 2018
USD ($)
Nov. 30, 2017
CAD ($)
Nov. 30, 2017
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Feb. 28, 2018
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Unrealized gain on equity securities             $ 638.6 $ 896.9    
Unrealized gain on debt securities             53.5 53.5    
Long-term debt, including current portion   $ 9,206.5         9,206.5 9,206.5   $ 9,439.9
Carrying amount [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Long-term debt, including current portion   9,206.5         9,206.5 9,206.5   9,439.9
Fair value [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Long-term debt, including current portion   9,015.6         $ 9,015.6 9,015.6   $ 9,398.4
Equity securities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Payments to acquire investments $ 5,100.0 $ 4,000.0     $ 245.0 $ 191.3        
Convertible debt securities [Member]                    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                    
Payments to acquire investments     $ 200.0 $ 150.5       $ 150.5 $ 0.0