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Share Based Compensation Arrangement By Share Based Payment Award Options Expire Duration

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Share-based Payment Arrangement, Converted Awards, Incremental Cost

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Share-based Payment Arrangement, Converted Awards, Incremental Cost Recognized

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Share-based Payment Arrangement, Converted Awards, Incremental Cost Related to Accelerated Vesting of Equity Awards

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Performance Percentage

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

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

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Net number of share options (or share units) granted during the period.

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Percentage of vesting of award under share-based payment arrangement.

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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 - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares)	3,570,891
Stock based compensation expense	$ 41.2	$ 26.5	$ 28.2
Tax benefit from exercise of stock options	10.1	6.6	6.9
Excess tax benefit from share-based compensation, operating activities	$ 2.6	$ 4.8	$ 5.7
Stock options granted (in shares)	400,000	293,000	361,000
Aggregate Intrinsic value of options exercised	$ 24.9	$ 6.5	$ 6.6
Fair value of options vested	7.8	4.6	3.5
Continuing Operations
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense	$ 35.8	$ 21.2	$ 21.3
2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unexercised options lapse period (in years)	10 years
2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unexercised options lapse period (in years)	10 years
Employee Matters Agreement
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation Expense, Award Modifications	$ 5.2
Retirement-Related Modifications
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Converted wards, incremental cost	4.5
Converted awards, incremental cost related to accelerated vesting of equity awards	8.7
Converted awards, incremental cost recognized	$ 13.2
Employee Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares)	75,314
Unrecognized compensation expense related to non-vested award	$ 13.5
Unrecognized compensation expense related to non-vested award, recognition period (in years)	1 year 4 months 2 days
Weighted average grant date fair value (in dollars per share)	$ 38.55	$ 42.07	$ 35.74
Employee Stock \| Minimum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	1 year
Employee Stock \| Minimum \| 2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	1 year
Employee Stock \| Maximum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	3 years
Employee Stock \| Maximum \| 2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	5 years
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock granted (in shares)	375,000	225,000	248,000
Weighted average grant date fair value (in dollars per share)	$ 41.45	$ 54.28	$ 46.01
Total fair value of shares vesting	$ 10.5	$ 14.6	$ 24.8
Restricted Stock \| Executive Officer Performance Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	3 years
Restricted Stock \| Minimum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	1 year
Restricted Stock \| Minimum \| 2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	1 year
Restricted Stock \| Maximum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	3 years
Restricted Stock \| Maximum \| 2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	5 years
Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total fair value of shares vesting	$ 18.4	$ 22.1	$ 22.6
Performance Share Units \| Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance percentage	0.00%
Performance Share Units \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance percentage	200.00%
Performance criteria is met \| Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting rights (percentage)	33.33%
One-year service period \| Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	1 year
Award vesting rights (percentage)	33.33%
Award requisite service period (in years)	1 year
Two-year service period \| Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting rights (percentage)	33.33%
Award requisite service period (in years)	2 years