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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 4.2 | $ 2.5 | $ 9.0 | $ 3.4
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 0.6 | 0.8 | 2.3 | 1.6
Stock options granted in period (shares) | 19,370 |  |  |
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 0.9 | 2.0 | 3.4 | 3.0
Equity instruments other than options granted in period (shares) | 2,835 |  |  |
Restricted stock units | Non-employee Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 0.2 | 0.2 | 1.0 | 1.0
Equity instruments other than options granted in period (shares) | 83,167 |  |  |
Performance stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 2.7 | $ (0.3) | $ 3.3 | $ (1.2)
Equity instruments other than options granted in period (shares) | 11,622 |  |  |

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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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