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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) - USD ($) $ in Millions | 3 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Jul. 21, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 8.7 | $ 15.2 |  |  | $ 26.9 | $ 5.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 770,500 |  |
Restricted Stock Award, Forfeitures |  |  | $ 11.5 |  |  |
Total | 83.5 |  |  |  | 83.5 |
Equity Option [Member] |  |  |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 8.1 | 14.7 |  |  | 25.1 | 14.7
Restricted Stock Units [Member] |  |  |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 0.6 | 0.4 |  |  | 1.8 | (1.5)
Restricted Stock [Member] |  |  |  |  |  |
Share -based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 0.0 | $ 0.1 |  |  | $ 0.0 | $ (7.8)

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