Description of Business and Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash

A reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets follows:

	Successor		Predecessor
(dollars in millions)	December 31, 2021		December 31, 2020		December 31, 2019
Cash and cash equivalents	$	5.6	$	12.2	$	11.6
Restricted cash included in Other noncurrent assets		0.5		5.0		—
Cash, cash equivalents and restricted cash per Consolidated Statements of Cash Flows	$	6.1	$	17.2	$	11.6