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Share-based Compensation (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, fair value of awards granted	$ 12.5
Allocated share-based compensation expense	3.4	$ 2.9
Share based compensation expense not yet recognized	$ 18.0
Period in which unrecognized share based compensation will be recognized (in years)	2 years 4 months 24 days
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)	60
Share-based compensation, shares exercised (shares)	100
Share-based compensation, vesting period (in years)	4 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, restricted shares granted (shares)	50
Share-based compensation, vesting period (in years)	3 years
Share-based compensation, shares vested other than options (shares)	70
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation, restricted shares granted (shares)	30
Share-based compensation, vesting period (in years)	3 years
Share-based compensation, shares vested 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)	70

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

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

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