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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Schedule of Reorganization Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reorganizations [Abstract]
Write-off of unamortized debt discounts, premiums and issuance costs	$ 447.9		$ 447.9	$ 0.0
Reorganization items (non-cash)			447.9
DIP facility fees			23.8
Professional fees			25.8
Reorganization Items (Fees)			49.6
Total reorganization items, net	$ 497.5	$ 0.0	497.5	$ 0.0
Reorganization items (fees) unpaid			25.8
Reorganization items (fees) paid			$ 23.8

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Amount of reorganization items related to debtor-in-possession facility financing costs.

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

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