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Stock-based Compensation - Options Outstanding (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Additional disclosures |  |  |
Compensation expense recognized | $ 7.1 | $ 3.8 | $ 3.5
Period over which cost will be recognized | 3 years |  |
Stock option awards |  |  |
Additional disclosures |  |  |
Compensation expense recognized |  | $ 0.1 | $ 0.2

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