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Stock-Based Compensation Plans - Compensation expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2017
Stock-Based Compensation Plans |  |  |  |
Compensation expense | $ 9.4 | $ 15.9 | $ 50.7 | $ 26.1

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