Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v3.8.0.1
Fair Value of Financial Instruments (Details Textual)
$ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2017
CAD ($)
Nov. 30, 2017
USD ($)
May 31, 2018
USD ($)
May 31, 2017
USD ($)
Feb. 28, 2018
USD ($)
Fair Value Disclosures [Abstract]          
Payments to acquire equity securities $ 245.0 $ 191.3      
Unrealized gain on equity securities     $ 258.3 $ 0.0  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, including current portion     9,437.3   $ 9,439.9
Carrying amount [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, including current portion     9,437.3   9,439.9
Fair value [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Long-term debt, including current portion     $ 9,308.2   $ 9,398.4