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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payout Potential Cap

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Share based compensation arrangement by share based payment award options exercisable rate.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payout Potential Range

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weighted average of shares for total future compensation cost related to unvested share-based awards

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weighted average period for unvested share-based RSUs to be recognized

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

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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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The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

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Amount of cash inflow from exercise of option under share-based payment 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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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award expense	$ 6.0	$ 6.4	$ 5.7
Weighted-average fair value of options granted during period	$ 20.82	$ 15.18	$ 15.79
Fair value of shares vested	$ 6.3	$ 6.2	$ 6.3
Total intrinsic value of options exercised	36.4	4.1	6.8
Aggregate intrinsic value of exercisable options	33.9	29.5	39.4
Cash received from options exercised	26.4	8.9	11.4
Tax benefit realized for tax deductions from exercise of options	5.5	0.5	0.8
Total future compensation costs related to unvested share-based awards	$ 8.5
Weighted average of shares for total future compensation cost related to unvested share-based awards	1 year 8 months 1 day
Tax (detriment) benefit for vesting of restricted share units	$ (0.1)	(0.1)	2.8
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award expense	$ 18.3	$ 15.1	$ 15.6
Vesting payout cap	100.00%
Period of time to measure Company total shareholder return and apply vesting payout cap (in years)	3 years
Total future compensation costs related to restricted share units and performance-based restricted share unit awards	$ 27.1
Weighted average period for unvested share-based RSUs to be recognized	1 year 11 months 23 days
Restricted Stock And Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting payout potential range	0.00%
Restricted Stock And Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting payout potential range	200.00%
Options Exercisable After First Year \| Share-based Payment Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	25.00%
Options Exercisable After First Year \| Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	25.00%
Options Exercisable After Second Year \| Share-based Payment Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	50.00%
Options Exercisable After Second Year \| Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	50.00%
Options Exercisable After Third Year \| Share-based Payment Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	75.00%
Options Exercisable After Third Year \| Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	75.00%
Options Exercisable After Fourth Year \| Share-based Payment Arrangement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	100.00%
Options Exercisable After Fourth Year \| Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable rate	100.00%
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	9,500,000
2018 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	6,500,000
2021 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	4,710,000