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Debt (Details Numeric 2) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2018
Mar. 02, 2018
Feb. 27, 2015
Nov. 30, 2018
Jan. 21, 2015
Jun. 13, 2014
Feb. 28, 2010
Notes 2020 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount             $ 900.0
Debt Instrument, Interest Rate, Stated Percentage             4.75%
Debt Instrument, Unamortized Discount             $ 5.5
Unamortized Debt Issuance Expense             $ 6.4
Debt Instrument, Interest Rate, Effective Percentage             4.92%
Notes 2025 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 1,000.0    
Debt Instrument, Interest Rate, Stated Percentage         3.25%    
Proceeds from Issuance of Debt     $ 989.3        
Debt Instrument, Unamortized Discount         $ 10.7    
Unamortized Debt Issuance Expense         $ 7.9    
Debt Instrument, Interest Rate, Effective Percentage         3.67%    
Notes 2020 and 2025 [Member]              
Debt Instrument [Line Items]              
Senior Notes, Carrying Value       $ 1,880.0      
Debt Instrument, Fair Value Disclosure       $ 1,890.0      
Repurchase notes at price of their principal amount plus accrued and unpaid interest             101.00%
Debt Instrument, Periodic Payment, Interest $ 37.6 $ 37.6          
Fair Value Hedging [Member]              
Debt Instrument [Line Items]              
Derivative, Notional Amount           $ 900.0  
Derivative, Fixed Interest Rate           4.75%