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Earnings Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2022
Apr. 30, 2021
Jun. 30, 2022
Earnings Per Share [Abstract]          
Net Income (Loss) Attributable to Parent $ (3,557.0) $ (6.2) $ 111.6 $ (4,467.0) $ 73.0
Antidilutive share options excluded from computation of diluted earnings per share (in shares) 300,000 29,000 13,000 300,000 6,000
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 $ (3,600.0)     $ (4,500.0)