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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2019
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 three months ended March 31, 2019:
 
Foreign Currency Translation
Adjustment
 
Prior Service
Credit (Cost) Associated
with
Postretirement
Plans
 
Total Accumulated Other Comprehensive Income
 
(Dollars in millions)
December 31, 2018
$
(4.5
)
 
$
44.6

 
$
40.1

Reclassification from other comprehensive income to earnings
—

 
(2.2
)
 
(2.2
)
Current period change
0.1

 
—

 
0.1

March 31, 2019
$
(4.4
)
 
$
42.4

 
$
38.0