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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income
Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
 
March 31, 2019
 
December 31, 2018
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.5 million and $11.4 million at March 31, 2019 and December 31, 2018, respectively
$
(27.7
)
 
$
(28.2
)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $1.6 million and $1.6 million at March 31, 2019 and December 31, 2018, respectively
(1.1
)
 
(0.6
)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $4.0 million and $1.7 million at March 31, 2019 and December 31, 2018, respectively
(95.0
)
 
(95.7
)
Accumulated other comprehensive loss
$
(123.8
)
 
$
(124.5
)
Changes in Components of Other Comprehensive Income
Changes in the components of Accumulated other comprehensive loss were as follows ($ in millions):
 
Three Months Ended
 
March 31, 2019
 
March 31, 2018
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Net (loss) gain on pension and OPEB liability adjustments
$
(0.6
)
 
$
1.1

 
$
0.5

 
$
1.1

 
$
(0.4
)
 
$
0.7

Unrealized (loss) gain on derivative instruments
(0.5
)
 
—

 
(0.5
)
 
1.8

 
(0.1
)
 
1.7

Unrealized (loss) gain on foreign currency translation
(1.6
)
 
2.3

 
0.7

 
9.5

 
(1.1
)
 
8.4

Total
$
(2.7
)
 
$
3.4

 
$
0.7

 
$
12.4

 
$
(1.6
)
 
$
10.8