Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

After-tax components of comprehensive income (loss)

The following table sets forth the after-tax components of accumulated other comprehensive income and changes thereto recorded during the nine months ended September 30, 2021:

	Foreign Currency Translation Adjustment		Prior Service Credit Associated with Postretirement Plans		Total Accumulated Other Comprehensive Income
	(Dollars in millions)
December 31, 2020	$	1.8	$	204.0	$	205.8
Reclassification from other comprehensive income to earnings	—		(33.0)		(33.0)
Current period change	(1.2)		—		(1.2)
September 30, 2021	$	0.6	$	171.0	$	171.6