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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
After-tax components of comprehensive income (loss)
The following table sets forth the after-tax components of accumulated other comprehensive (loss) income and changes thereto:
Foreign
Currency
Translation
Adjustment		Prior Service
Credit (Cost) Associated
with
Postretirement
Plans		Total
Accumulated
Other
Comprehensive
Income
 (Dollars in millions)
December 31, 2017$1.4 $— $1.4 
Current period change(5.9)44.6 38.7 
December 31, 2018(4.5)44.6 40.1 
Reclassification from other comprehensive income to earnings— (8.7)(8.7)
Current period change0.2 — 0.2 
December 31, 2019(4.3)35.9 31.6 
Reclassification from other comprehensive income to earnings— (17.3)(17.3)
Current period change6.1 185.4 191.5 
December 31, 2020$1.8 $204.0 $205.8