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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Aug. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Long-term debt $ 1,700.0    
Unaccreted discount and debt issuance costs (13.5)    
Debt Instrument, Derivative Instruments Fair Value Adjustment 1.1    
Total 1,687.6    
Notional amount of derivatives 995.3   $ 656.4
Designated as hedge      
Debt Instrument [Line Items]      
Notional amount of derivatives 833.4   497.7
Designated as hedge | Fair value hedges | Interest rate swap contracts      
Debt Instrument [Line Items]      
Notional amount of derivatives $ 300.0   $ 0.0
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 | 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]      
Stated interest rate   3.75%  
Long-term debt $ 500.0    
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%