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Debt (Details Numeric 2) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 21, 2015
Mar. 01, 2019
Oct. 17, 2018
Jun. 13, 2014
Mar. 02, 2012
Feb. 28, 2010
Notes 2020            
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            
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            
Debt Instrument [Line Items]            
Senior Notes, Carrying Value   $ 1,880.0        
Debt Instrument, Periodic Payment, Interest   37.6        
Repurchase notes at price of their principal amount plus accrued and unpaid interest           101.00%
Debt Instrument, Fair Value Disclosure   1,920.0        
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Unamortized Debt Issuance Expense     $ 0.8      
Line of Credit Facility, Current Borrowing Capacity     $ 1,000.0   $ 1,000.0  
Fair Value Hedging            
Debt Instrument [Line Items]            
Derivative, Notional Amount       $ 900.0    
Derivative, Fixed Interest Rate       4.75%    
Notes 2020            
Debt Instrument [Line Items]            
Debt instrument, face value, reclass long-term to short-term debt, amount   $ 898.7