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Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| March 31, 2017 |  | December 31, 2016
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $17.4 million and $17.6 million at March 31, 2017 and December 31, 2016, respectively | $ | (35.4 | ) |  | $ | (36.5 | )
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.6 million and $3.0 million at March 31, 2017 and December 31, 2016, respectively | (0.6 | ) |  | (1.9 | )
Accumulated unrealized foreign currency translation adjustments | (95.0 | ) |  | (100.9 | )
Accumulated other comprehensive loss | $ | (131.0 | ) |  | $ | (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
| March 31, 2017 |  | March 31, 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 |  |  | $ | (0.7 | ) |  | $ | 0.2 |  |  | $ | (0.5 | )
Unrealized gain (loss) on derivative instruments | 1.7 |  |  | (0.4 | ) |  | 1.3 |  |  | 8.0 |  |  | 3.9 |  |  | 11.9 |
Unrealized gain on foreign currency translation | 5.9 |  |  | — |  |  | 5.9 |  |  | 14.0 |  |  | — |  |  | 14.0 |
Total | $ | 8.9 |  |  | $ | (0.6 | ) |  | $ | 8.3 |  |  | $ | 21.3 |  |  | $ | 4.1 |  |  | $ | 25.4 |

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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=66004124&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=66004124&loc=d3e526-108580 + Details
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