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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Components of Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive loss were as follows ($ in millions):
 
December 31,
 
2015
 
2014
Accumulated pension and OPEB liability adjustments, net of income tax impact of $21.9 million and $21.0 million at December 31, 2015 and 2014, respectively
$
(35.6
)
 
$
(38.4
)
Accumulated unrealized loss on derivative instruments, net of income tax impact of $0.3 million and $0 at December 31, 2015 and 2014, respectively
(21.6
)
 
(8.3
)
Accumulated unrealized foreign currency translation adjustments
(84.2
)
 
(29.8
)
Accumulated other comprehensive loss
$
(141.4
)
 
$
(76.5
)
Changes in the Components of Accumulated Other Comprehensive Loss
Changes in the components of accumulated other comprehensive loss were as follows ($ in millions):
 
For the Years Ended December 31,
 
2015
 
2014
 
2013
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Pension and OPEB liability adjustments
$
1.9

 
$
0.9

 
$
2.8

 
$
(12.7
)
 
$
4.4

 
$
(8.3
)
 
$
19.8

 
$
(6.7
)
 
$
13.1

Unrealized loss on derivative instruments
(13.6
)
 
0.3

 
(13.3
)
 
(0.4
)
 
0.2

 
(0.2
)
 
(4.9
)
 
(1.8
)
 
(6.7
)
Unrealized foreign currency translation adjustments
(54.4
)
 
—

 
(54.4
)
 
(63.0
)
 
—

 
(63.0
)
 
4.0

 
—

 
4.0

Total
$
(66.1
)
 
$
1.2

 
$
(64.9
)
 
$
(76.1
)
 
$
4.6

 
$
(71.5
)
 
$
18.9

 
$
(8.5
)
 
$
10.4