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Earnings (Loss) Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Apr. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2022
Earnings Per Share [Abstract] |  |  |  |  |
Net Income (Loss) Attributable to Parent | $ 74.3 | $ (54.5) | $ (4,467.0) | $ (60.7) | $ 147.3
Antidilutive share options excluded from computation of diluted earnings per share (in shares) | 38,000 | 600,000 | 300,000 | 400,000,000,000 | 103,000
Class of Warrant or Right, Outstanding | 5,470,971 |  |  |  | 5,470,971
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 131.88 |  |  |  | $ 131.88
Warranted, Period Exercisable |  |  |  |  | 7 years
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  |  | $ (4,467.0) |  |

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