Employee Service Share-Based Compensation, Tax Benefit Realized From Vesting of Restricted Stock

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Weighted Average Grant Date Fair Value

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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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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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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Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3.9	$ 4.7	$ 11.7	$ 15.9
Stock based compensation tax benefit	0.5	$ 0.1	1.2	$ 1.6
Excess tax benefit			0.5
Unrecognized compensation cost	$ 0.2		0.2
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock options exercised			$ 14.1
Period for recognition of compensation not yet recognized			6 months
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or performance stock awards outstanding (in shares)	0		0
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of compensation not yet recognized			1 year 7 months 6 days
Restricted stock or performance stock awards outstanding (in shares)	1,100,000		1,100,000		1,000,000.0
Tax benefit realized on the vesting of restricted stock			$ 0.1
Compensation not yet recognized, share-based awards other than options	$ 16.2		$ 16.2
Performance Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or performance stock awards outstanding (in shares)	0		0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition of compensation not yet recognized			2 years 3 months 18 days
Restricted stock or performance stock awards outstanding (in shares)	700,000		700,000		500,000
Compensation not yet recognized, share-based awards other than options	$ 8.9		$ 8.9
Performance stock awards expected to vest (in shares)	400,000		400,000
Weighted average fair value per share of performance stock awards expected to vest (in usd per share)	$ 29.74		$ 29.74