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Share-based Compensation - Share-based Plans Narratives (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares outstanding (shares) | 280,000 | 360,000 |
Share-based compensation expense | $ 11.2 | $ 8.6 | $ 8.8
Tax benefit related to share-based compensation | 2.2 | $ 1.6 | $ 2.7
Share based compensation not yet recognized | $ 9.9 |  |
Recognition period for unrecognized share based compensation | 1 year 10 months 24 days |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Share based compensation not yet recognized | $ 2.6 |  |
Recognition period for unrecognized share based compensation | 2 years 4 months 24 days |  |
Restricted stock and RSU's |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares other than options outstanding unvested (shares) | 110,000 | 190,000 |
Share based compensation not yet recognized | $ 4.3 |  |
Recognition period for unrecognized share based compensation | 1 year 8 months 12 days |  |
Performance units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares other than options outstanding unvested (shares) | 90,000.00 | 70,000.00 |
Share based compensation not yet recognized | $ 3.0 |  |
Recognition period for unrecognized share based compensation | 1 year 8 months 12 days |  |
2017 Omnibus Equity Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of shares authorized (shares) | 1,700,000 |  |
2017 Omnibus Equity Plan | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares outstanding (shares) | 240,000 |  |
2017 Omnibus Equity Plan | Restricted stock and RSU's |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares other than options outstanding unvested (shares) | 110,000 |  |
2017 Omnibus Equity Plan | Performance units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares other than options outstanding unvested (shares) | 90,000.00 |  |
2009 Omnibus Equity Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Number of shares authorized (shares) | 3,350,000 |  |
2009 Omnibus Equity Plan | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares outstanding (shares) | 50,000.00 |  |

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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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