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Debt - 2029 and 2049 Notes Issued in 2019 (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 04, 2020
Jun. 29, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Long-term debt, gross     $ 2,320,300,000 $ 2,334,400,000  
Loss on extinguishment of debt $ 21,100,000 $ 10,600,000 21,100,000 10,600,000 $ 0
Payments of related issuance costs     7,000,000.0 6,500,000 $ 0
Senior Notes          
Debt Instrument [Line Items]          
Proceeds from offering     669,100,000 693,300,000  
Loss on extinguishment of debt       10,600,000  
Payments of related issuance costs     $ 6,000,000.0 6,500,000  
Senior Notes | 2029 Notes          
Debt Instrument [Line Items]          
Aggregate principal amount       $ 375,000,000.0  
Stated interest rate     4.25% 4.25%  
Stated coupon rate       99.691%  
Yield to maturity     4.288% 4.288%  
Long-term debt, gross     $ 375,000,000.0 $ 375,000,000.0  
Senior Notes | 2049 Notes          
Debt Instrument [Line Items]          
Aggregate principal amount     $ 300,000,000.0 $ 325,000,000.0  
Stated interest rate     5.25% 5.25%  
Stated coupon rate     106.626% 98.32%  
Yield to maturity     4.821% 5.363%  
Long-term debt, gross       $ 325,000,000.0  
Senior Notes | 2024 Notes          
Debt Instrument [Line Items]          
Stated coupon rate       102.688%  
Long-term debt, gross       $ 325,000,000.0