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Senior Notes (Narrative) (Details) - USD ($)		9 Months Ended
	May 31, 2018	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Redemption period		180 days
Senior Notes 4.25%
Debt Instrument [Line Items]
Debt instrument, term		80 years
Senior Notes
Debt Instrument [Line Items]
Long-term debt measured at fair value		$ 317,200,000
Principal amount		$ 400,000,000	$ 400,000,000
Senior Notes | Period One
Debt Instrument [Line Items]
Redemption price percentage	102.13%
Senior Notes | Period Two
Debt Instrument [Line Items]
Redemption price percentage	101.06%
Senior Notes | Period Four
Debt Instrument [Line Items]
Percentage of principal amount redeemed	40.00%
Senior Notes | Period Five
Debt Instrument [Line Items]
Redemption price percentage	104.25%	101.00%
Senior Notes | Period Six
Debt Instrument [Line Items]
Redemption price percentage		100.00%
Percentage of principal amount redeemed	50.00%
Senior Note Two | Senior Notes 4.25%
Debt Instrument [Line Items]
Stated interest rate percentage		4.25%
Senior Note Two | Senior Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs		4.30%
Senior Note One | Senior Notes
Debt Instrument [Line Items]
Effective interest rate on unamortized debt discount		4.42%

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