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Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Income | Components of Accumulated other comprehensive loss, net of tax, were as follows ($ in millions):
| March 31, 2021 |  | December 31, 2020
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $12.2 million and $11.6 million at March 31, 2021 and December 31, 2020, respectively | $ | (18.8) |  |  | $ | (20.5) |
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.8 million and $2.8 million at March 31, 2021 and December 31, 2020, respectively | (8.7) |  |  | (13.1) |
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $6.8 million and $10.1 million at March 31, 2021 and December 31, 2020, respectively | (88.2) |  |  | (78.3) |
Accumulated other comprehensive loss | $ | (115.7) |  |  | $ | (111.9) |
Changes in Components of Other Comprehensive Income | Changes in the components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
| Three Months Ended
| March 31, 2021 |  | March 31, 2020
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Net gain (loss) on pension and OPEB liability adjustments | $ | 1.1 |  |  | $ | 0.6 |  |  | $ | 1.7 |  |  | $ | 0.7 |  |  | $ | (0.2) |  |  | $ | 0.5 |
Unrealized gain (loss) on derivative instruments | 4.5 |  |  | (0.1) |  |  | 4.4 |  |  | (15.6) |  |  | 2.9 |  |  | (12.7) |
Unrealized (loss) gain on foreign currency translation | (6.5) |  |  | (3.4) |  |  | (9.9) |  |  | (4.1) |  |  | 0.6 |  |  | (3.5) |
Total | $ | (0.9) |  |  | $ | (2.9) |  |  | $ | (3.8) |  |  | $ | (19.0) |  |  | $ | 3.3 |  |  | $ | (15.7) |

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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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