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Accumulated Other Comprehensive Income
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income
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, 2020:
Foreign Currency Translation
Adjustment		Prior Service
Credit (Cost) Associated
with
Postretirement
Plans		Total Accumulated Other Comprehensive Income
 (Dollars in millions)
December 31, 2019$(4.3)$35.9 $31.6 
Reclassification from other comprehensive income to earnings— (6.6)(6.6)
Current period change1.8 174.5 176.3 
September 30, 2020$(2.5)$203.8 $201.3 
Postretirement health care and life insurance benefits reclassified from other comprehensive income to earnings of $2.2 million during both the three months ended September 30, 2020 and 2019 and $6.6 million during both the nine months ended September 30, 2020 and 2019 are included in “Net periodic benefit costs, excluding service cost” in the unaudited condensed consolidated statements of operations. As previously described in Note 13. “Pension and Postretirement Benefit Costs,” the Company recorded $174.5 million within accumulated other comprehensive income during the three and nine month period ended September 30, 2020 related to changes to one of its postretirement health care benefit plans.