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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| June 30, 2021 |  | December 31, 2020
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $11.7 million and $11.6 million at June 30, 2021 and December 31, 2020, respectively | $ | (18.0) |  |  | $ | (20.5) |
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.6 million and $2.8 million at June 30, 2021 and December 31, 2020, respectively | (9.5) |  |  | (13.1) |
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $6.8 million and $10.1 million at June 30, 2021 and December 31, 2020, respectively | (78.8) |  |  | (78.3) |
Accumulated other comprehensive loss | $ | (106.3) |  |  | $ | (111.9) |
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
| June 30, 2021 |  | June 30, 2020
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Net gain (loss) on pension and OPEB liability adjustments | $ | 1.2 |  |  | $ | (0.4) |  |  | $ | 0.8 |  |  | $ | 1.1 |  |  | $ | (0.3) |  |  | $ | 0.8 |
Unrealized (loss) gain on derivative instruments | (2.6) |  |  | 1.8 |  |  | (0.8) |  |  | 0.2 |  |  | (0.3) |  |  | (0.1) |
Unrealized gain (loss) on foreign currency translation | 9.3 |  |  | 0.1 |  |  | 9.4 |  |  | (0.8) |  |  | 1.4 |  |  | 0.6 |
Total | $ | 7.9 |  |  | $ | 1.5 |  |  | $ | 9.4 |  |  | $ | 0.5 |  |  | $ | 0.8 |  |  | $ | 1.3 |
| Six Months Ended
| June 30, 2021 |  | June 30, 2020
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Unrealized gain (loss) on pension and OPEB liability adjustments | $ | 2.3 |  |  | $ | 0.2 |  |  | $ | 2.5 |  |  | $ | 1.8 |  |  | $ | (0.5) |  |  | $ | 1.3 |
Unrealized gain (loss) on derivative instruments | 3.8 |  |  | (0.2) |  |  | 3.6 |  |  | (15.4) |  |  | 2.6 |  |  | (12.8) |
Unrealized gain (loss) on foreign currency translation | 2.8 |  |  | (3.3) |  |  | (0.5) |  |  | (4.9) |  |  | 2.0 |  |  | (2.9) |
Total | $ | 8.9 |  |  | $ | (3.3) |  |  | $ | 5.6 |  |  | $ | (18.5) |  |  | $ | 4.1 |  |  | $ | (14.4) |

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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=124509347&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=124509347&loc=d3e526-108580 + Details
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