Financial Instruments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Interest rate Swaps Recorded in Condensed Consolidated Balance Sheets

As of December 31, 2020, the fair value of the interest rate swap liability was $25.4 million and is recorded in the Consolidated Balance Sheets as follows:

		Predecessor
				Quoted Prices in		Significant		Significant
		December 31,		Active Markets		Observable Inputs		Unobservable Inputs
(dollars in millions)	Balance Sheet Location	2020		Level 1		Level 2		Level 3
Liabilities:
Interest Rate Swap	Other current liabilities	$	9.3	$	—	$	9.3	$	—
Interest Rate Swap	Other noncurrent liabilities	$	16.1	$	—	$	16.1	$	—

Amount of Gains (Losses) Recognized in Accumulated Other Comprehensive Income Net of Reclassification into Earnings

The amount of gains (losses) recognized in AOCI (effective portion) net of reclassifications into earnings is as follows:

	Successor		Predecessor		Predecessor
	September 8, 2021 to		January 1, 2021 to		Year Ended
(dollars in millions)	Decemeber 31, 2021		September 7, 2021		December 31, 2020
Interest Rate Swap	$	—	$	5.3	$	(6.4	)

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

The amount of losses reclassified from AOCI into earnings is as follows:

		Successor		Predecessor			Predecessor
		September 8, 2021 to		January 1, 2021 to			Year Ended
(dollars in millions)	Statement of Operations Location	Decemeber 31, 2021		September 7, 2021			December 31, 2020
Interest Rate Swap	Other (income) expense, net	$	—	$	(20.1	)	$	—
Interest Rate Swap	Interest expense	$	—	$	(5.4	)	$	(8.4	)

Schedule of Carrying and Fair Values by Balance Sheet Grouping

The carrying and fair values of these items are as follows:

	Successor				Predecessor
	December 31, 2021				December 31, 2020
(dollars in millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt, including current portion*	$	1,443.0	$	1,443.0	$	1,921.8	$	1,973.4
Other financing arrangements		53.1		51.7		42.1		58.6

* Excludes finance leases, other financing arrangements and note issuance costs