Share Based Compensation Arrangement By Share Based Payment Award Vest Performance Target Range

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- Definition

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

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- Definition

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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- 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

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

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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 15.3	$ 13.7	$ 9.5
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0.6	0.6
Grant date fair value	$ 22.01	$ 28.10
Awards vesting period	3 years
Performance Share Units [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target range	0.00%
Performance Share Units [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target range	250.00%
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted	0.6	0.3	0.5
Grant date fair value	$ 23.85	$ 30.43	$ 24.14
Restricted Stock Units [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	1 year
Restricted Stock Units [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years