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Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
May 31, 2019
May 24, 2019
May 23, 2019
Debt Instrument [Line Items]              
Debt, carrying value $ 2,750,000,000.0   $ 2,750,000,000.0   $ 2,866,200,000    
Debt, fair value 2,954,300,000   2,954,300,000   2,998,700,000    
(Payments) issuance of commercial paper, net     (112,500,000) $ 173,500,000      
Debt due within one year 199,788,000   199,788,000   312,264,000    
Amortization of interest rate lock agreements - increase (decrease) to other comprehensive income (400,000) $ (300,000) (700,000) $ (600,000)      
Treasury Lock              
Debt Instrument [Line Items]              
Notional amount 700,000,000.0   700,000,000.0   500,000,000.0    
Interest rate lock asset 12,200,000   12,200,000        
Interest rate lock liability $ 58,300,000   $ 58,300,000   36,400,000    
Term loan due 2020              
Debt Instrument [Line Items]              
Variable borrowing rate 2.44%   2.44%        
Revolving credit facility              
Debt Instrument [Line Items]              
Revolving credit facility, maximum borrowing capacity with accordion feature           $ 1,000,000,000.0 $ 600,000,000.0
Revolving credit facility amount outstanding $ 0   $ 0   0    
Revolving credit facility | Term loan due 2020              
Debt Instrument [Line Items]              
Revolving credit facility, maximum borrowing capacity with accordion feature           200,000,000.0  
Annual extension term     12 months        
Extension term     4 years        
Credit agreement              
Debt Instrument [Line Items]              
Debt amendment, increase limit (up to)           $ 250,000,000.0  
Commercial paper              
Debt Instrument [Line Items]              
(Payments) issuance of commercial paper, net (112,500,000)            
Debt due within one year $ 0   $ 0   $ 112,500,000    
Variable borrowing rate         2.68%