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Share-based Compensation (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense	$ 3.2	$ 6.3
Share based compensation expense not yet recognized	$ 14.2
Period in which unrecognized share based compensation will be recognized	2 years 263 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, shares granted (shares)	200
Share-based compensation, shares exercised (shares)	50
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)	100
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, restricted shares granted (shares)	20
Share-based compensation, shares vested other than options (shares)	1,400
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, restricted shares granted (shares)	20
Share-based compensation, vesting period	3 years
Management
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of awards granted	$ 12.0
Director
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of restricted shares granted	$ 0.2

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

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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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Unrecognized cost of unvested share-based compensation awards.

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

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

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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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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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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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