Equity (Tables)

12 Months Ended

Dec. 31, 2023

Shareowners Deficit [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component

The changes in accumulated other comprehensive income (loss) by component were as follows:

(dollars in millions)	Unrecognized Net Periodic Pension and Postretirement Benefit (Cost)				Foreign Currency Translation Gain (Loss)			Total
Balance as of December 31, 2021	$	2.6			$	(1.4	)	$	1.2
Remeasurement of benefit obligations		25.1				—			25.1
Reclassifications, net		(0.6	)	(a)		—			(0.6	)
Foreign currency loss		—				(6.2	)		(6.2	)
Balance as of December 31, 2022	$	27.1			$	(7.6	)	$	19.5
Remeasurement of benefit obligations		10.5				—			10.5
Reclassifications, net		(4.4	)	(a)		—			(4.4	)
Foreign currency gain		—				2.6			2.6
Balance as of December 31, 2023	$	33.2			$	(5.0	)	$	28.2

(a)These reclassifications are included in the other components of net periodic pension and postretirement benefit plans expense and represent amortization of prior service benefit and actuarial gain, net of tax. The other components of net periodic pension and postretirement benefit plans expense are recorded in "Other components of pension and postretirement benefit plans expense (benefit)" on the Consolidated Statements of Operations. See Note 11 for further disclosures.