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Share-based Compensation (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
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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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- Definition Shares Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Total Fair Value + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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