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Share Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock based compensation plans |  |  |  |
Share-based Payment Arrangement, Noncash Expense | $ 2.2 | $ 2.1 | $ 7.3 | $ 7.9
Employee Service Share-based Compensation Not yet Recognized | $ 11.3 |  | $ 11.3 |
Employees | Restricted Stock |  |  |  |
Stock based compensation plans |  |  |  |
Grants of restricted shares (in shares) |  |  | 207,077 |
Shares withheld for tax withholding obligation |  |  | 85,466 |
Non-employees, Directors | Restricted Stock |  |  |  |
Stock based compensation plans |  |  |  |
Grants of restricted shares (in shares) |  |  | 23,025 |

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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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