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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, 2021 | Jun. 30, 2020 | Apr. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Earnings Per Share [Abstract] |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent | $ (3,600.0) |  | $ (6.2) | $ (1,100.0) | $ (4,500.0) |  | $ (4,100.0)
Antidilutive share options excluded from computation of diluted earnings per share (in shares) | 300,000 | 29,000 |  | 400,000 | 300,000 |  | 400,000
Class of Warrant or Right, Outstanding |  | 5,645,161 | 5,645,161 |  |  | 5,645,161 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 131.88 | $ 131.88 |  |  | $ 131.88 |
Warranted, Period Exercisable |  |  |  |  |  | 7 years |

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