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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income
Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
 
March 31, 2018
 
December 31, 2017
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.4 million and $13.8 million at March 31, 2018 and December 31, 2017, respectively
$
(24.2
)
 
$
(24.9
)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $0.1 million and $0.2 million at March 31, 2018 and December 31, 2017, respectively
2.1

 
0.4

Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $3.4 million and $4.5 million at March 31, 2018 and December 31, 2017, respectively
(56.5
)
 
(64.9
)
Accumulated other comprehensive loss
$
(78.6
)
 
$
(89.4
)
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, 2018
 
March 31, 2017
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Unrealized gain (loss) on pension and OPEB liability adjustments
$
1.1

 
$
(0.4
)
 
$
0.7

 
$
1.3

 
$
(0.2
)
 
$
1.1

Unrealized gain (loss) on derivative instruments
1.8

 
(0.1
)
 
1.7

 
1.7

 
(0.4
)
 
1.3

Unrealized gain (loss) on foreign currency translation
9.5

 
(1.1
)
 
8.4

 
5.9

 
—

 
5.9

Total
$
12.4

 
$
(1.6
)
 
$
10.8

 
$
8.9

 
$
(0.6
)
 
$
8.3