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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)