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Debt Obligations - Debt Repurchases & Extinguishments - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended		6 Months Ended	12 Months Ended
	Sep. 01, 2020	Nov. 30, 2020	Feb. 28, 2019	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2020	Jan. 31, 2019
Debt Instrument [Line Items]
Write-off debt issuance cost				$ 2.4
Debt repurchased, payment				239.8
Debt repurchased, book value				303.3
Gain (loss) from financing activities				61.1	$ 45.6	$ (1.4)	$ (2.0)
Debt repurchased, gain				$ 63.5	$ 45.6	$ (1.4)	$ (2.0)
Senior Unsecured 6¾% Notes due March 2024 [Member]
Debt Instrument [Line Items]
Write-off debt issuance cost	$ 2.6
Face amount of notes redeemed	318.0							$ 262.1
Loss due to debt extinguishments	13.7
Premium Paid	$ 11.1
Senior Unsecured 5¼% Notes due May 2023 [Member]
Debt Instrument [Line Items]
Face amount of notes redeemed		$ 559.6
Loss due to debt extinguishments		$ 1.8
Senior Unsecured Notes [Member] | Senior Unsecured 4 1/8% notes due November 2019 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt									4.125%
Senior Unsecured Notes [Member] | Senior Unsecured 6¾% Notes due March 2024 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt	6.75%							6.75%
Senior Unsecured Notes [Member] | Senior Unsecured 5¼% Notes due May 2023 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt		5.25%
Partnership Issuers [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4 1/8% notes due November 2019 [Member]
Debt Instrument [Line Items]
Redemption price, percentage of face value			4.125%
Maturity year			2019
Write-off debt issuance cost			$ 1.4

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Debt instrument maturity year.

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Debt instrument repurchased amount book value.

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Interest and debt income expense.

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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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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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