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Special Charges (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Special charges for workforce reductions and advisory costs | $ (0.1) | $ (0.6) | $ 0.0 | $ 0.1 | $ (0.3) | $ (0.8) | $ 2.9 | $ 0.1 | $ (0.6) | $ 1.9
Termination benefit costs |  |  |  |  |  |  |  |  | 0.6 |
Contract Termination [Member] |  |  |  |  |  |  |  |  |  |
Termination benefit costs |  |  |  |  |  |  |  |  | $ 0.0 |

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