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Long-term Debt - Textual (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended
	May 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Oct. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 0	$ 0	$ 0	$ 2,300,000
Senior Notes
Debt Instrument [Line Items]
Proceeds from debt issuance costs	$ 583,000,000
Senior Notes | 4.50% Senior Notes due 2028
Debt Instrument [Line Items]
Aggregate principal amount	$ 300,000,000
Debt instrument interest rate (percent)	4.50%		4.50%		4.50%			4.50%
Issuance of face value (percent)	99.00%
Redemption amount			$ 784,600,000		$ 784,600,000			$ 491,700,000
Senior Notes | 4.75% Senior Notes due 2030
Debt Instrument [Line Items]
Aggregate principal amount	$ 300,000,000
Debt instrument interest rate (percent)	4.75%		4.75%		4.75%			4.75%
Issuance of face value (percent)	98.50%
Redemption amount			$ 782,800,000		$ 782,800,000			$ 491,700,000
Senior Notes | 4.625% Senior Notes due 2031 | Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount							$ 400,000,000
Debt instrument interest rate (percent)							4.625%
Senior Notes | 5.75% Senior Notes due 2024
Debt Instrument [Line Items]
Debt instrument interest rate (percent)			5.75%		5.75%			5.75%
Redemption amount			$ 697,700,000		$ 697,700,000			$ 697,300,000
Senior Notes | 5.75% Senior Notes due 2024 | Subsequent Event
Debt Instrument [Line Items]
Debt instrument interest rate (percent)							5.75%
Redemption amount							$ 700,000,000
Senior Notes | 5.75% Senior Notes due 2024 | Subsequent Event | Forecast
Debt Instrument [Line Items]
Loss on early extinguishment of debt		$ 2,000,000

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Face (par) amount of debt instrument at time of issuance.

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

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