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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Long-term Debt (Narrative) (Details) - USD ($)		3 Months Ended			6 Months Ended
Long-term Debt (Narrative) (Details) - USD ($)	Feb. 08, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Proceeds from the issuance of long-term debt					$ 984,500,000	$ 6,000,000
Loss on extinguishment of debt		$ 0		$ 0	$ 22,074,000	$ 2,908,000
Revolving credit facility
Debt Instrument [Line Items]
Total credit facilities	$ 500,000,000
Term Loan A Facility \| Secured debt
Debt Instrument [Line Items]
Total credit facilities	675,000,000
4.25% Notes due February 2029 \| Senior Notes
Debt Instrument [Line Items]
Total credit facilities	$ 1,000,000,000.0
Interest rate	4.25%	4.25%			4.25%
Proceeds from the issuance of long-term debt	$ 982,300,000
4.75% Notes due December 2022 \| Senior Notes
Debt Instrument [Line Items]
Interest rate	4.75%	4.75%			4.75%
Redemption of principal amount	$ 400,000,000
Redemption price (as a percentage)	100.00%
Loss on extinguishment of debt			$ 22,100,000
5.00% Notes due April 2024 \| Senior Notes
Debt Instrument [Line Items]
Interest rate	5.00%	5.00%			5.00%
Redemption of principal amount	$ 600,000,000
Redemption price (as a percentage)	102.50%