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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Components of Accumulated Other Comprehensive Loss
Components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
 
December 31,
 
2019
 
2018
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.8 million and $11.4 million at December 31, 2019 and 2018, respectively
$
(24.3
)
 
$
(28.2
)
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $1.6 million and $1.6 million at December 31, 2019 and 2018, respectively
(3.5
)
 
(0.6
)
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $5.0 million and $1.7 million at December 31, 2019 and 2018, respectively
(94.8
)
 
(95.7
)
Accumulated other comprehensive loss
$
(122.6
)
 
$
(124.5
)
Changes in the Components of Accumulated Other Comprehensive Loss
Changes in the components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
 
For the Years Ended December 31,
 
2019
 
2018
 
2017
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
 
Pre-tax
 
Tax
 
Net of
Tax
Pension and OPEB liability adjustments
$
2.5

 
$
1.4

 
$
3.9

 
$
(0.9
)
 
$
(2.4
)
 
$
(3.3
)
 
$
15.4

 
$
(3.8
)
 
$
11.6

Derivative instrument adjustments
(2.9
)
 
—

 
(2.9
)
 
(2.4
)
 
1.4

 
(1.0
)
 
5.1

 
(2.8
)
 
2.3

Unrealized foreign currency translation adjustments
(2.5
)
 
3.4

 
0.9

 
(28.0
)
 
(2.8
)
 
(30.8
)
 
31.5

 
4.5

 
36.0

Total
$
(2.9
)
 
$
4.8

 
$
1.9

 
$
(31.3
)
 
$
(3.8
)
 
$
(35.1
)
 
$
52.0

 
$
(2.1
)
 
$
49.9