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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 1.8 | $ 0.9 | $ 5.2 | $ 6.3
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 0.5 | 0.7 | 2.1 | 2.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 34,359 |  |  |
Restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 1.3 | 1.2 | 4.3 | 4.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 10,311 |  |  |
Restricted stock units | Director [Member] | Fully Vested On The Grant Date [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) |  |  | 1.0 | 1.0
Performance stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense (income) | $ 0.0 | $ (1.0) | $ (1.2) | $ 0.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 20,618 |  |  |

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