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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Capital Stock and Equity Compensation (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Nov. 09, 2021	Sep. 30, 2021	Sep. 30, 2020
Chief Executive Officer \| Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense that will be expensed from date of grant through retirement eligibility date			$ 4.0
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, measurement period (years)				3 years
Expected dividend yield (percent)				0.00%
Compensation expense	$ 2.6	$ 1.6		$ 5.8	$ 4.3
Performance-Based Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)				0.00%
Performance-Based Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)				200.00%
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	2.0	1.5		$ 5.8	4.6
Conversion ratio				1
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0.0	$ 0.0		$ 1.2	$ 1.0
Conversion ratio				1
Vesting period				13 months