Equity Incentive Program - RSUs (Details) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of SSARs that are exercisable \| $	$ 21.9
Stock Options
Weighted Average Grant Date Fair Value (in dollars per share):
Unrecognized compensation expense \| $	$ 2.5
Weighted average period for compensation expense to be recognized	1 year 1 month 6 days
Restricted Stock Units (RSUs)
Number of Shares (in shares):
Beginning balance \| shares	1,909,786
Granted \| shares	1,159,374
Vested (1) \| shares	(1,068,104)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period \| shares	(222,417)
Ending balance \| shares	1,778,639
Weighted Average Grant Date Fair Value (in dollars per share):
Beginning balance \| $ / shares	$ 16.14
Granted \| $ / shares	20.59
Vested (1) \| $ / shares	15.81
Forfeited \| $ / shares	18.42
Ending balance \| $ / shares	$ 18.89
Unrecognized compensation expense \| $	$ 19.7
Weighted average period for compensation expense to be recognized	1 year 7 months 6 days

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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