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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 18 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2021
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 9.1 | $ (10.9) | $ 18.2 | $ (9.8) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 770,500
Stock Issued During Period, Value, Restricted Stock Award, Forfeitures |  |  |  |  | $ 11.5
Total | 94.0 |  | 94.0 |  |
Equity Option [Member] |  |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 8.5 | 0.0 | 17.0 | 0.0 |
Restricted Stock Units [Member] |  |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 0.6 | (2.6) | 1.2 | (1.9) |
Restricted Stock [Member] |  |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 0.0 | $ (8.3) | $ 0.0 | $ (7.9) |

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