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Share-based Compensation (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Allocated share-based compensation expense	$ (1.9)	$ 0.1	$ 4.3	$ 3.0
Share based compensation expense not yet recognized	$ 13.0		$ 13.0
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			$ 10.3
Director
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of restricted shares granted			$ 0.3
CEO
Share-based Compensation Arrangement by Share-based Payment Award
Credits to share-based compensation related to forfeitures		$ (1.8)		$ (1.8)
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, shares granted (shares)			100
Share-based compensation, shares exercised (shares)			280
Share-based compensation, stock option forfeited (shares)			20
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

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

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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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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 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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