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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive loss were as follows ($ in millions):
 
December 31,
 
2014
 
2013
Accumulated pension and OPEB liability adjustments, net of income tax impact of $21.0 million and $16.6 million at December 31, 2014 and 2013, respectively
$
(38.4
)
 
$
(30.1
)
Accumulated unrealized loss on derivative instruments, net of income tax impact of $0 and $0.3 million at December 31, 2014 and 2013, respectively
(8.3
)
 
(8.1
)
Accumulated unrealized foreign currency translation adjustments
(29.8
)
 
33.2

Accumulated other comprehensive loss
$
(76.5
)
 
$
(5.0
)
Schedule of Comprehensive Loss
Changes in the components of accumulated other comprehensive loss were as follows ($ in millions):
 
For the Years Ended December 31,
 
2014
 
2013
 
2012
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Pension and OPEB liability adjustments
$
(12.7
)
 
$
4.4

 
$
(8.3
)
 
$
19.8

 
$
(6.7
)
 
$
13.1

 
$
2.5

 
$
(1.5
)
 
$
1.0

Unrealized loss on derivative instruments
(0.4
)
 
0.2

 
(0.2
)
 
(4.9
)
 
(1.8
)
 
(6.7
)
 
(2.7
)
 
0.9

 
(1.8
)
Unrealized foreign currency translation adjustments
(63.0
)
 
—

 
(63.0
)
 
4.0

 
—

 
4.0

 
9.9

 
—

 
9.9

Total
$
(76.1
)
 
$
4.6

 
$
(71.5
)
 
$
18.9

 
$
(8.5
)
 
$
10.4

 
$
9.7

 
$
(0.6
)
 
$
9.1