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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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