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Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| September 30, 2020 |  | December 31, 2019
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.0 million and $12.8 million at September 30, 2020 and December 31, 2019, respectively | $ | (22.2) |  |  | $ | (24.3) |
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $3.9 million and $1.6 million at September 30, 2020 and December 31, 2019, respectively | (15.5) |  |  | (3.5) |
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $8.8 million and $5.0 million at September 30, 2020 and December 31, 2019, respectively | (90.5) |  |  | (94.8) |
Accumulated other comprehensive loss | $ | (128.2) |  |  | $ | (122.6) |
Changes in Components of Other Comprehensive Income | Changes in the components of Accumulated other comprehensive income (loss) were as follows ($ in millions):
| Three Months Ended
| September 30, 2020 |  | September 30, 2019
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Net gain (loss) on pension and OPEB liability adjustments | $ | 1.1 |  |  | $ | (0.3) |  |  | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | (0.6) |  |  | $ | 0.1 |
Unrealized gain (loss) on derivative instruments | 1.1 |  |  | (0.3) |  |  | 0.8 |  |  | (4.1) |  |  | 1.1 |  |  | (3.0) |
Unrealized gain (loss) on foreign currency translation | 5.5 |  |  | 1.7 |  |  | 7.2 |  |  | (9.0) |  |  | (1.5) |  |  | (10.5) |
Total | $ | 7.7 |  |  | $ | 1.1 |  |  | $ | 8.8 |  |  | $ | (12.4) |  |  | $ | (1.0) |  |  | $ | (13.4) |
| Nine Months Ended
| September 30, 2020 |  | September 30, 2019
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 2.9 |  |  | $ | (0.8) |  |  | $ | 2.1 |  |  | $ | 0.9 |  |  | $ | 0.7 |  |  | $ | 1.6 |
Unrealized (loss) gain on derivative instruments | (14.3) |  |  | 2.3 |  |  | (12.0) |  |  | (5.6) |  |  | 1.2 |  |  | (4.4) |
Unrealized gain (loss) on foreign currency translation | 0.6 |  |  | 3.7 |  |  | 4.3 |  |  | (8.7) |  |  | 0.9 |  |  | (7.8) |
Total | $ | (10.8) |  |  | $ | 5.2 |  |  | $ | (5.6) |  |  | $ | (13.4) |  |  | $ | 2.8 |  |  | $ | (10.6) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + 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=121641772&loc=d3e526-108580 + Details
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