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Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)
3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
May 31, 2019
May 24, 2019
May 23, 2019
Debt Instrument [Line Items]          
Debt, carrying value $ 2,889,000,000.0   $ 2,866,200,000    
Debt, fair value 3,115,000,000.0   2,998,700,000    
Debt due within one year 338,776,000   312,264,000    
Amortization of interest rate lock agreements (300,000) $ (300,000)      
Treasury Lock          
Debt Instrument [Line Items]          
Notional amount 500,000,000.0        
Interest rate lock agreements $ 76,100,000   36,400,000    
Term loan due 2020          
Debt Instrument [Line Items]          
Variable borrowing rate 2.88%        
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    
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]          
Issuance of commercial paper, net $ 26,500,000        
Debt due within one year $ 139,000,000.0   $ 112,500,000    
Variable borrowing rate 2.36%   2.68%