Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Narrative (Details)

v3.20.2
Borrowings - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 31, 2020
Apr. 30, 2020
Aug. 31, 2020
May 31, 2020
Aug. 31, 2019
May 31, 2019
Aug. 31, 2020
Aug. 31, 2019
Mar. 31, 2020
Feb. 29, 2020
Oct. 31, 2018
Nov. 30, 2017
Schedule of Debt [Line Items]                        
Debt instrument, face amount                 $ 2,000,000,000.0      
Short-term borrowings $ 0   $ 0       $ 0     $ 238,900,000    
Other comprehensive income (loss), net of income tax effect     211,400,000 $ (792,300,000) $ (129,400,000) $ (2,700,000)            
Make-whole payment             6,200,000          
Unamortized debt issuance costs, long-term debt obligations 66,900,000   66,900,000       66,900,000          
Unamortized discount, long-term debt obligations 17,900,000   17,900,000       17,900,000          
Net unrealized gain (loss) on derivative instruments                        
Schedule of Debt [Line Items]                        
Other comprehensive income (loss), net of income tax effect   $ (21,800,000) 53,900,000   $ (35,600,000)   (134,100,000) $ (41,200,000)        
Derivative instruments designated as hedging instruments | Treasury lock contracts                        
Schedule of Debt [Line Items]                        
Aggregate notional value of derivative instruments $ 0   $ 0       $ 0   500,000,000.0 300,000,000.0    
Average fixed interest rate, interest rate swap contracts 1.20%   1.20%       1.20%          
Commercial paper                        
Schedule of Debt [Line Items]                        
Debt instrument, face amount                     $ 2,000,000,000.0  
Short-term borrowings $ 0   $ 0       $ 0     $ 238,900,000    
Term Credit Agreement | Unsecured debt                        
Schedule of Debt [Line Items]                        
Debt instrument, face amount                 1,500,000,000      
Three-Year Term Facility | Unsecured debt                        
Schedule of Debt [Line Items]                        
Debt instrument, face amount                 500,000,000.0      
Five-Year Term Facility | Unsecured debt                        
Schedule of Debt [Line Items]                        
Debt instrument, face amount                 1,000,000,000.0      
2019 Five-Year Term Facility | Unsecured debt                        
Schedule of Debt [Line Items]                        
Debt instrument, face amount 491,300,000   $ 491,300,000       $ 491,300,000   $ 491,300,000      
April 2020 Senior Notes | Unsecured debt                        
Schedule of Debt [Line Items]                        
Debt instrument, face amount   $ 1,200,000,000.0                    
Proceeds from issuance of long-term debt, net of discount and debt issuance costs $ 1,183,300,000                      
2.25% November 2017 Senior Notes | Unsecured debt                        
Schedule of Debt [Line Items]                        
Debt instrument, face amount                       $ 700,000,000.0
Coupon rates of notes                       2.25%