Financing Activity - Interest Expense and Deferred Financing Amortization (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2021
Credit Agreements and Restructured Credit Agreements \| Second lien Term Loans
Debt Instrument [Line Items]
Interest expense	$ 12.3	$ 35.7

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Name:	us-gaap_InterestExpenseDebtExcludingAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration