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Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| March 31, 2018 |  | December 31, 2017
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.4 million and $13.8 million at March 31, 2018 and December 31, 2017, respectively | $ | (24.2 | ) |  | $ | (24.9 | )
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $0.1 million and $0.2 million at March 31, 2018 and December 31, 2017, respectively | 2.1 |  |  | 0.4 |
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $3.4 million and $4.5 million at March 31, 2018 and December 31, 2017, respectively | (56.5 | ) |  | (64.9 | )
Accumulated other comprehensive loss | $ | (78.6 | ) |  | $ | (89.4 | )
Changes in Components of Other Comprehensive Income | Changes in the components of Accumulated other comprehensive loss were as follows ($ in millions):
| Three Months Ended
| March 31, 2018 |  | March 31, 2017
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 1.1 |  |  | $ | (0.4 | ) |  | $ | 0.7 |  |  | $ | 1.3 |  |  | $ | (0.2 | ) |  | $ | 1.1 |
Unrealized gain (loss) on derivative instruments | 1.8 |  |  | (0.1 | ) |  | 1.7 |  |  | 1.7 |  |  | (0.4 | ) |  | 1.3 |
Unrealized gain (loss) on foreign currency translation | 9.5 |  |  | (1.1 | ) |  | 8.4 |  |  | 5.9 |  |  | — |  |  | 5.9 |
Total | $ | 12.4 |  |  | $ | (1.6 | ) |  | $ | 10.8 |  |  | $ | 8.9 |  |  | $ | (0.6 | ) |  | $ | 8.3 |

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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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