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Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (60.7)	$ (54.5)	$ (700.0)	$ (4,500.0)			$ (4,800.0)
Antidilutive share options excluded from computation of diluted earnings per share (in shares)	300,000	600,000	400,000	300,000	400,000		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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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