Share-based Compensation (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense	$ 2.9	$ 2.4
Share based compensation expense not yet recognized	$ 15.9
Period in which unrecognized share based compensation will be recognized	2 years 4 months 24 days
Management
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of awards granted	$ 11.0
Director
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of restricted shares granted	$ 0.2
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, shares granted (shares)	110
Share-based compensation, shares exercised (shares)	90
Share-based compensation, stock option forfeited (shares)	30
Share-based compensation, vesting period	4 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, restricted shares granted (shares)	80
Share-based compensation, vesting period	3 years
Share-based compensation, shares vested other than options (shares)	90
Share-based compensation, shares forfeited other than options (shares)	10
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, restricted shares granted (shares)	40
Share-based compensation, vesting period	3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, shares vested other than options (shares)	90

Share-based Compensation Arrangement by Share-based Payment Award, Total Fair Value Granted During Period, Employees

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- Definition

Shares Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Total Fair Value

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- Definition

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

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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- 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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

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

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Number of share options (or share units) exercised during the current period.

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