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Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income
Components of accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
 
March 31, 2017
 
December 31, 2016
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $17.4 million and $17.6 million at March 31, 2017 and December 31, 2016, respectively
$
(35.4
)
 
$
(36.5
)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.6 million and $3.0 million at March 31, 2017 and December 31, 2016, respectively
(0.6
)
 
(1.9
)
Accumulated unrealized foreign currency translation adjustments
(95.0
)
 
(100.9
)
Accumulated other comprehensive loss
$
(131.0
)
 
$
(139.3
)
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, 2017
 
March 31, 2016
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Unrealized gain (loss) on pension and OPEB liability adjustments
$
1.3

 
$
(0.2
)
 
$
1.1

 
$
(0.7
)
 
$
0.2

 
$
(0.5
)
Unrealized gain (loss) on derivative instruments
1.7

 
(0.4
)
 
1.3

 
8.0

 
3.9

 
11.9

Unrealized gain on foreign currency translation
5.9

 
—

 
5.9

 
14.0

 
—

 
14.0

Total
$
8.9

 
$
(0.6
)
 
$
8.3

 
$
21.3

 
$
4.1

 
$
25.4