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Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| September 30, 2019 |  | December 31, 2018
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.1 million and $11.4 million at September 30, 2019 and December 31, 2018, respectively | $ | (26.6 | ) |  | $ | (28.2 | )
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.8 million and $1.6 million at September 30, 2019 and December 31, 2018, respectively | (5.0 | ) |  | (0.6 | )
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $2.6 million and $1.7 million at September 30, 2019 and December 31, 2018, respectively | (103.5 | ) |  | (95.7 | )
Accumulated other comprehensive loss | $ | (135.1 | ) |  | $ | (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
| September 30, 2019 |  | September 30, 2018
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Net gain (loss) on pension and OPEB liability adjustments | $ | 0.7 |  |  | $ | (0.6 | ) |  | $ | 0.1 |  |  | $ | 1.0 |  |  | $ | (0.2 | ) |  | $ | 0.8 |
Unrealized (loss) gain on derivative instruments | (4.1 | ) |  | 1.1 |  |  | (3.0 | ) |  | (0.4 | ) |  | — |  |  | (0.4 | )
Unrealized (loss) gain on foreign currency translation | (9.0 | ) |  | (1.5 | ) |  | (10.5 | ) |  | (3.1 | ) |  | 0.1 |  |  | (3.0 | )
Total | $ | (12.4 | ) |  | $ | (1.0 | ) |  | $ | (13.4 | ) |  | $ | (2.5 | ) |  | $ | (0.1 | ) |  | $ | (2.6 | )
| Nine Months Ended
| September 30, 2019 |  | September 30, 2018
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 0.9 |  |  | $ | 0.7 |  |  | $ | 1.6 |  |  | $ | 3.2 |  |  | $ | (0.9 | ) |  | $ | 2.3 |
Unrealized (loss) gain on derivative instruments | (5.6 | ) |  | 1.2 |  |  | (4.4 | ) |  | (3.0 | ) |  | 1.3 |  |  | (1.7 | )
Unrealized (loss) gain on foreign currency translation | (8.7 | ) |  | 0.9 |  |  | (7.8 | ) |  | (23.6 | ) |  | (1.8 | ) |  | (25.4 | )
Total | $ | (13.4 | ) |  | $ | 2.8 |  |  | $ | (10.6 | ) |  | $ | (23.4 | ) |  | $ | (1.4 | ) |  | $ | (24.8 | )

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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=118930883&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=118930883&loc=d3e526-108580 + Details
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