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Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| March 31, 2019 |  | December 31, 2018
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.5 million and $11.4 million at March 31, 2019 and December 31, 2018, respectively | $ | (27.7 | ) |  | $ | (28.2 | )
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $1.6 million and $1.6 million at March 31, 2019 and December 31, 2018, respectively | (1.1 | ) |  | (0.6 | )
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $4.0 million and $1.7 million at March 31, 2019 and December 31, 2018, respectively | (95.0 | ) |  | (95.7 | )
Accumulated other comprehensive loss | $ | (123.8 | ) |  | $ | (124.5 | )
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, 2019 |  | March 31, 2018
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Net (loss) gain on pension and OPEB liability adjustments | $ | (0.6 | ) |  | $ | 1.1 |  |  | $ | 0.5 |  |  | $ | 1.1 |  |  | $ | (0.4 | ) |  | $ | 0.7 |
Unrealized (loss) gain on derivative instruments | (0.5 | ) |  | — |  |  | (0.5 | ) |  | 1.8 |  |  | (0.1 | ) |  | 1.7 |
Unrealized (loss) gain on foreign currency translation | (1.6 | ) |  | 2.3 |  |  | 0.7 |  |  | 9.5 |  |  | (1.1 | ) |  | 8.4 |
Total | $ | (2.7 | ) |  | $ | 3.4 |  |  | $ | 0.7 |  |  | $ | 12.4 |  |  | $ | (1.6 | ) |  | $ | 10.8 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
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