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Debt and Financing - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Aug. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Long-term debt $ 1,700.0    
Unaccreted discount and debt issuance costs (13.0)    
Hedge accounting fair value adjustment (3.1)    
Total 1,683.9    
Notional amount $ 946.9   $ 656.4
4.500% fixed-rate notes (2024 Notes)      
Debt Instrument [Line Items]      
Stated interest rate 4.50%    
4.500% fixed-rate notes (2024 Notes)      
Debt Instrument [Line Items]      
Stated interest rate 4.50%    
4.350% fixed-rate notes (2025 Notes)      
Debt Instrument [Line Items]      
Stated interest rate 4.35%    
3.750% fixed-rate notes (2029 Notes)      
Debt Instrument [Line Items]      
Stated interest rate 3.75%    
5.950% fixed-rate notes (2041 Notes)      
Debt Instrument [Line Items]      
Stated interest rate 5.95%    
Senior Notes      
Debt Instrument [Line Items]      
Long-term debt $ 1,700.0    
Senior Notes | 4.500% fixed-rate notes (2024 Notes)      
Debt Instrument [Line Items]      
Long-term debt $ 350.0    
Effective interest rate 4.63%    
Senior Notes | 4.500% fixed-rate notes (2024 Notes)      
Debt Instrument [Line Items]      
Long-term debt $ 150.0    
Effective interest rate 4.87%    
Senior Notes | 4.350% fixed-rate notes (2025 Notes)      
Debt Instrument [Line Items]      
Long-term debt $ 300.0    
Effective interest rate 4.47%    
Senior Notes | 3.750% fixed-rate notes (2029 Notes)      
Debt Instrument [Line Items]      
Long-term debt $ 500.0    
Stated interest rate   3.75%  
Effective interest rate 3.86%    
Senior Notes | 5.950% fixed-rate notes (2041 Notes)      
Debt Instrument [Line Items]      
Long-term debt $ 400.0    
Effective interest rate 6.03%    
Designated as hedge      
Debt Instrument [Line Items]      
Notional amount $ 784.0   497.7
Fair Value Hedging | Interest Rate Swap | Designated as hedge      
Debt Instrument [Line Items]      
Notional amount $ 300.0   $ 0.0