Stock-Based and Deferred Compensation Plans - Summary of Time Based Restricted Award Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
Dec. 31, 2021	Sep. 07, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Compensation expense for the year	$ 0.0	$ 4.3	$ 5.6	$ 7.4
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Shares, Non-vested, Beginning balance	0	792	942	497
Shares, Granted	0	0	68	625
Shares, Vested	0	(792)	(216)	(167)
Shares, Forfeited	0	0	(2)	(13)
Shares, Non-vested, Ending balance	0	0	792	942
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Exercise Price Per Share, Non-vested, Beginning balance	$ 0	$ 11.42	$ 11.67	$ 17.02
Weighted-Average Exercise Price Per Share, Granted	0	0	14.99	8.43
Weighted-Average Exercise Price Per Share, Vested	0	11.42	13.58	15.39
Weighted-Average Exercise Price Per Share, Forfeited	0	0	15.70	12.76
Weighted-Average Exercise Price Per Share, Non-vested, Ending balance	$ 0	$ 0	$ 11.42	$ 11.67
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Compensation expense for the year	$ 0.0	$ 6.9	$ 3.2	$ 4.7
Tax benefit related to compensation expense	0.0	(1.7)	(0.7)	(1.1)
Grant date fair value of awards vested	$ 0.0	$ 9.0	$ 2.9	$ 2.6

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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