Share-based Compensation (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense	$ 2.4	$ 2.9
Share based compensation expense not yet recognized	$ 14.6
Period in which unrecognized share based compensation will be recognized	2 years 7 months 14 days
Management
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of awards granted	$ 9.8
Director
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of restricted shares granted	$ 0.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, shares granted (shares)	100
Share-based compensation, shares exercised (shares)	250
Share-based compensation, stock option forfeited (shares)	10
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)	70
Share-based compensation, vesting period	3 years
Share-based compensation, shares forfeited other than options (shares)	10
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, shares vested other than options (shares)	110
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, restricted shares granted (shares)	30
Share-based compensation, vesting period	3 years
Share-based compensation, shares forfeited other than options (shares)	20

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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No definition available.

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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

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

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 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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No definition available.

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

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