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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Components of Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive loss were as follows ($ in millions):
 
December 31,
 
2016
 
2015
Accumulated pension and OPEB liability adjustments, net of income tax impact of $17.6 million and $21.9 million at December 31, 2016 and 2015, respectively
$
(36.5
)
 
$
(35.6
)
Accumulated unrealized loss on derivative instruments, net of income tax impact of $(3.0) million and $0.3 million at December 31, 2016 and 2015, respectively
(1.9
)
 
(21.6
)
Accumulated unrealized foreign currency translation adjustments
(100.9
)
 
(84.2
)
Accumulated other comprehensive loss
$
(139.3
)
 
$
(141.4
)
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,
 
2016
 
2015
 
2014
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Pension and OPEB liability adjustments
$
3.4

 
$
(4.3
)
 
$
(0.9
)
 
$
1.9

 
$
0.9

 
$
2.8

 
$
(12.7
)
 
$
4.4

 
$
(8.3
)
Unrealized loss on derivative instruments
23.0

 
(3.3
)
 
19.7

 
(13.6
)
 
0.3

 
(13.3
)
 
(0.4
)
 
0.2

 
(0.2
)
Unrealized foreign currency translation adjustments
(16.7
)
 
—

 
(16.7
)
 
(54.4
)
 
—

 
(54.4
)
 
(63.0
)
 
—

 
(63.0
)
Total
$
9.7

 
$
(7.6
)
 
$
2.1

 
$
(66.1
)
 
$
1.2

 
$
(64.9
)
 
$
(76.1
)
 
$
4.6

 
$
(71.5
)