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Debt 2030 Notes and 2049 Notes Issued in 2020 (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
2030 Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 350,000,000.0
Stated interest rate			3.50%
Stated coupon rate			99.774%
Yield to maturity			3.525%
Long-term debt, gross			$ 350,000,000.0
2049 Notes | Senior 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
2025 Notes | Senior Notes
Debt Instrument [Line Items]
Stated interest rate				5.25%
Stated coupon rate			102.625%
Yield to maturity				5.25%
Long-term debt, gross			$ 650,000,000.0	$ 650,000,000.0

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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