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

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Long-Term Debt - 6.750% Senior Unsecured Notes due 2025 (Details) - USD ($)		1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2018
Debt Instrument [Line Items]
Unpaid interest			$ 218,700,000	$ 194,300,000	$ 203,600,000
Senior Notes \| 6.750% Senior Unsecured Notes due 2025
Debt Instrument [Line Items]
Debt instrument, stated rate (percent)		6.75%	6.75%			6.75%
Original balance of debt						$ 370,000,000
Repayments of unsecured notes		$ 185,000,000
Redemption price, percentage (percent)		100.00%	100.00%
Unpaid interest			$ 6,200,000
Senior Notes \| 6.750% Senior Unsecured Notes due 2025 \| Redemption Period Three
Debt Instrument [Line Items]
Redemption price, percentage (percent)	101.00%