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Income Taxes - Schedule of Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Computed federal income tax expense (benefit)	$ 8.6	$ 3.9	$ 15.8
State income taxes	0.0	(1.5)	1.4
Changes in valuation allowances	1.0	5.3	(8.0)
REIT rate differential	(9.3)	(7.8)	(9.0)
Nontaxable or nondeductible items	(0.1)	0.0	0.0
Share-based compensation	(0.2)	(0.1)	0.1
Effective rate differences between current and deferred taxes	0.0	0.4	(0.5)
Pension termination	0.0	(18.3)	0.0
Other, net	0.0	(0.2)	0.2
Income tax expense (benefit)	$ 0.0	$ (18.3)	$ 0.0

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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