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Reorganization Items, Net Reorganization Items, Net (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended	12 Months Ended
	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Fresh-Start Adjustment [Line Items]
Gain on settlement of claims	$ 3,031.2		$ (3,031.2)			$ (12.8)
Fresh start adjustments, net			3,363.1			0.0
Fresh start income tax adjustments, net			253.9			0.0
Professional fees	$ 336.4		42.5			0.0
Accounts payable settlement gains			(0.7)			0.0
Interest income			(0.4)			0.0
Reorganization items, net		$ 12.8	$ 627.2	$ 0.0	$ 0.0	$ (12.8)

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Debtor Reorganization Items, Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity, before Tax

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Amount of net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item.

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Amount of interest income on accumulated cash, reported as a reorganization item.

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Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

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Total amount of reorganization items.

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