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Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2017
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| June 30, 2017 |  | December 31, 2016
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $17.2 million and $17.6 million at June 30, 2017 and December 31, 2016, respectively | $ | (34.3 | ) |  | $ | (36.5 | )
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $5.0 million and $3.0 million at June 30, 2017 and December 31, 2016, respectively | (4.9 | ) |  | (1.9 | )
Accumulated unrealized foreign currency translation adjustments | (75.2 | ) |  | (100.9 | )
Accumulated other comprehensive loss | $ | (114.4 | ) |  | $ | (139.3 | )
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, 2017 |  | June 30, 2016
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 1.3 |  |  | $ | (0.2 | ) |  | $ | 1.1 |  |  | $ | 3.4 |  |  | $ | (1.8 | ) |  | $ | 1.6 |
Unrealized (loss) gain on derivative instruments | (6.7 | ) |  | 2.4 |  |  | (4.3 | ) |  | 5.7 |  |  | — |  |  | 5.7 |
Unrealized gain (loss) on foreign currency translation | 19.8 |  |  | — |  |  | 19.8 |  |  | (8.9 | ) |  | — |  |  | (8.9 | )
Total | $ | 14.4 |  |  | $ | 2.2 |  |  | $ | 16.6 |  |  | $ | 0.2 |  |  | $ | (1.8 | ) |  | $ | (1.6 | )
| Six Months Ended
| June 30, 2017 |  | June 30, 2016
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 2.6 |  |  | $ | (0.4 | ) |  | $ | 2.2 |  |  | $ | 2.7 |  |  | $ | (1.6 | ) |  | $ | 1.1 |
Unrealized (loss) gain on derivative instruments | (5.0 | ) |  | 2.0 |  |  | (3.0 | ) |  | 13.7 |  |  | 3.9 |  |  | 17.6 |
Unrealized gain on foreign currency translation | 25.7 |  |  | — |  |  | 25.7 |  |  | 5.1 |  |  | — |  |  | 5.1 |
Total | $ | 23.3 |  |  | $ | 1.6 |  |  | $ | 24.9 |  |  | $ | 21.5 |  |  | $ | 2.3 |  |  | $ | 23.8 |

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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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