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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Components of Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive income (loss) were as follows ($ in millions):
 
December 31,
 
2017
 
2016
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.8 million and $17.6 million at December 31, 2017 and 2016, respectively
$
(24.9
)
 
$
(36.5
)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $0.2 million and $3.0 million at December 31, 2017 and 2016, respectively
0.4

 
(1.9
)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $4.5 million and $0.0 million at December 31, 2017 and 2016, respectively
(64.9
)
 
(100.9
)
Accumulated other comprehensive loss
$
(89.4
)
 
$
(139.3
)
Changes in the Components of Accumulated Other Comprehensive Loss
Changes in the components of accumulated other comprehensive income (loss) were as follows ($ in millions):
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Pension and OPEB liability adjustments
$
15.4

 
$
(3.8
)
 
$
11.6

 
$
3.4

 
$
(4.3
)
 
$
(0.9
)
 
$
1.9

 
$
0.9

 
$
2.8

Derivative instrument adjustments
5.1

 
(2.8
)
 
2.3

 
23.0

 
(3.3
)
 
19.7

 
(13.6
)
 
0.3

 
(13.3
)
Unrealized foreign currency translation adjustments
31.5

 
4.5

 
36.0

 
(16.7
)
 
—

 
(16.7
)
 
(54.4
)
 
—

 
(54.4
)
Total
$
52.0

 
$
(2.1
)
 
$
49.9

 
$
9.7

 
$
(7.6
)
 
$
2.1

 
$
(66.1
)
 
$
1.2

 
$
(64.9
)