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Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| June 30, 2018 |  | December 31, 2017
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $13.1 million and $13.8 million at June 30, 2018 and December 31, 2017, respectively | $ | (23.4 | ) |  | $ | (24.9 | )
Accumulated unrealized (loss) gain on derivative instruments, net of income tax benefit of $1.5 million and $0.2 million at June 30, 2018 and December 31, 2017, respectively | (0.9 | ) |  | 0.4 |
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $2.6 million and $4.5 million at June 30, 2018 and December 31, 2017, respectively | (87.3 | ) |  | (64.9 | )
Accumulated other comprehensive loss | $ | (111.6 | ) |  | $ | (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
| June 30, 2018 |  | June 30, 2017
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 1.1 |  |  | $ | (0.3 | ) |  | $ | 0.8 |  |  | $ | 1.3 |  |  | $ | (0.2 | ) |  | $ | 1.1 |
Unrealized (loss) gain on derivative instruments | (4.4 | ) |  | 1.4 |  |  | (3.0 | ) |  | (6.7 | ) |  | 2.4 |  |  | (4.3 | )
Unrealized (loss) gain on foreign currency translation | (30.0 | ) |  | (0.8 | ) |  | (30.8 | ) |  | 19.8 |  |  | — |  |  | 19.8 |
Total | $ | (33.3 | ) |  | $ | 0.3 |  |  | $ | (33.0 | ) |  | $ | 14.4 |  |  | $ | 2.2 |  |  | $ | 16.6 |
| Six Months Ended
| June 30, 2018 |  | June 30, 2017
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 2.2 |  |  | $ | (0.7 | ) |  | $ | 1.5 |  |  | $ | 2.6 |  |  | $ | (0.4 | ) |  | $ | 2.2 |
Unrealized (loss) gain on derivative instruments | (2.6 | ) |  | 1.3 |  |  | (1.3 | ) |  | (5.0 | ) |  | 2.0 |  |  | (3.0 | )
Unrealized (loss) gain on foreign currency translation | (20.5 | ) |  | (1.9 | ) |  | (22.4 | ) |  | 25.7 |  |  | — |  |  | 25.7 |
Total | $ | (20.9 | ) |  | $ | (1.3 | ) |  | $ | (22.2 | ) |  | $ | 23.3 |  |  | $ | 1.6 |  |  | $ | 24.9 |

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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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