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Long-term Debt - Textual (Details)	1 Months Ended					12 Months Ended
	Nov. 30, 2020 USD ($)	May 31, 2020 USD ($)	Nov. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2015 USD ($)	Jan. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2012 USD ($)
Debt Instrument [Line Items]
Loss on early extinguishment of debt						$ 2,300,000	$ 7,700,000	$ 0
Senior Notes
Debt Instrument [Line Items]
Redemption price, (percent)						101.00%
Proceeds from debt issuance costs		$ 583,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Notes payable						$ 0	45,000,000.0
The Credit Agreement
Debt Instrument [Line Items]
Amounts outstanding under letter of credit facility						36,700,000	$ 38,900,000
The Credit Agreement | Term Loan Facilities
Debt Instrument [Line Items]
Commitment fee (percent)			0.375%
Senior secured leverage ratio maximum			2
Payment limit under the credit agreement's negative covenant			$ 200,000,000
The Credit Agreement | Fed Funds Effective Rate Overnight Index Swap Rate | Term Loan Facilities
Debt Instrument [Line Items]
Spread on variable rate (percent)			0.50%
The Credit Agreement | LIBOR | Term Loan Facilities
Debt Instrument [Line Items]
Spread on variable rate (percent)			1.50%
The Credit Agreement | Term loan facilities
Debt Instrument [Line Items]
Credit facility borrowing capacity			$ 270,000,000
Percentage of aggregate principal amount outstanding (percent)							1.25%
The Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility borrowing capacity			1,000,000,000
Applicable interest rate under credit facility (percent)							3.20%
The Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Credit facility borrowing capacity			$ 260,000,000
5.125% Senior Notes due 2023 | Senior Notes
Debt Instrument [Line Items]
Notes payable						$ 298,100,000	$ 297,300,000
Aggregate principal amount					$ 300,000,000
Debt instrument interest rate (percent)					5.125%	5.125%	5.125%
Net proceeds for offering					$ 295,000,000
Effective interest rate (percent)					5.40%
5.75% Senior Notes due 2024 | Senior Notes
Debt Instrument [Line Items]
Notes payable	$ 700,000,000					$ 0	$ 697,300,000
Redemption price, (percent)			100.958%	101.917%
Aggregate principal amount												$ 350,000,000	$ 400,000,000	$ 175,000,000	$ 275,000,000
Debt instrument interest rate (percent)						5.75%	5.75%								5.75%
Effective interest rate (percent)	5.80%
Debt issue price as percentage of principal (percent)												100.50%	102.00%	103.625%
Debt redeemed			$ 400,000,000	$ 100,000,000
Repayments of debt	$ 300,000,000		$ 404,000,000	$ 102,000,000
5.75% Senior Notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Notes payable						$ 346,300,000	$ 345,600,000
Aggregate principal amount											$ 350,000,000
Debt instrument interest rate (percent)						5.75%	5.75%				5.75%
Effective interest rate (percent)											6.00%
4.50% Senior Notes due 2028 | Senior Notes
Debt Instrument [Line Items]
Notes payable						$ 785,000,000.0	$ 491,700,000
Aggregate principal amount		$ 300,000,000								$ 500,000,000
Debt instrument interest rate (percent)						4.50%	4.50%			4.50%
Effective interest rate (percent)										4.80%
Issuance of face value (percent)		99.00%
4.75% Senior Notes due 2030 | Senior Notes
Debt Instrument [Line Items]
Notes payable						$ 783,200,000	$ 491,700,000
Aggregate principal amount		$ 300,000,000								$ 500,000,000
Debt instrument interest rate (percent)						4.75%	4.75%			4.75%
Effective interest rate (percent)										5.20%
Issuance of face value (percent)		98.50%
04.625% Senior Notes due 2031 | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount									$ 400,000,000
Debt instrument interest rate (percent)									4.625%
Effective interest rate (percent)									4.80%

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We are restricted from paying common stock dividends, prepaying certain senior notes, and repurchasing preferred and common equity unless (1) we are not in default under the terms of the Credit Agreement and (2) the amount of such payments, when added to the aggregate amount of prior restricted payments (as defined in the Credit Agreement) does not exceed $200 million, which amount is subject to increase by a portion of excess cash flows each fiscal year.

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