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Chapter 11 Proceedings and Ability to Continue as Going Concern - Schedule of Reorganization Items (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reorganizations [Abstract]
Write-off of unamortized debt discounts, premiums and issuance costs	$ 447.9
Contract items	(11.5)
Debtor Reorganization Items, Non-cash	436.4	$ 0.0	$ 0.0
DIP Facility fees	20.0
Professional fees	66.8
Debtor Reorganization Items, Provision for Expected Allowed Claims	4.4
Debtor Reorganization Items, Reorganization Items (Fees)	91.2
Reorganization Items, Total	527.6	$ 0.0	$ 0.0
Reorganization items (fees) unpaid	61.2
Reorganization items (fees) paid	$ 30.0

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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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