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- Definition

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

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Amount of expense for employee benefit and equity-based compensation.

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No definition available.

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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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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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- Definition

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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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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 share-based compensation awards.

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- Definition

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, 2018	Dec. 31, 2017	Dec. 31, 2016
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)	1,441,744
Stock based compensation expense	$ 28.2	$ 27.4	$ 21.5
Tax benefit from exercise of stock options	6.9	10.4	8.2
Excess tax benefit from share-based compensation, operating activities	$ 5.7	$ 1.1	$ 0.7
Stock options granted (in shares)	361,000	518,000	634,000
Aggregate Intrinsic value of options exercised	$ 6.6	$ 2.6	$ 0.4
Fair value of options vested	$ 3.5	$ 1.7	$ 1.4
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 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)	174,761
Compensation cost for ESPP	$ 0.2
Unrecognized compensation expense related to non-vested award	$ 24.6
Unrecognized compensation expense related to non-vested award, recognition period (in years)	1 year 4 months 2 days
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)	248,000	375,000	379,000
Weighted average grant date fair value (in dollars per share)	$ 46.01	$ 29.27	$ 22.81
Total fair value of shares vesting	$ 24.8	$ 9.9	$ 3.8
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 \| Minimum \| AMP Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)	4 years
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
Restricted Stock \| Maximum \| AMP 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]
Stock granted (in shares)	486,000
Weighted average grant date fair value (in dollars per share)	$ 38.51
Total fair value of shares vesting	$ 22.6	$ 7.9	$ 3.4
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