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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Components of Accumulated Other Comprehensive Loss | Components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
| December 31,
| 2021 |  | 2020
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $8.9 million and $11.6 million at December 31, 2021 and 2020, respectively | $ | (14.4) |  |  | $ | (20.5) |
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.1 million and $2.8 million at December 31, 2021 and 2020, respectively | (1.9) |  |  | (13.1) |
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $9.5 million and $10.1 million at December 31, 2021 and 2020, respectively | (102.7) |  |  | (78.3) |
Accumulated other comprehensive loss | $ | (119.0) |  |  | $ | (111.9) |
Changes in the Components of Accumulated Other Comprehensive Loss | Changes in the components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
| For the Years Ended December 31,
| 2021 |  | 2020 |  | 2019
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Pension and OPEB liability adjustments | $ | 8.9 |  |  | $ | (2.8) |  |  | $ | 6.1 |  |  | $ | 5.0 |  |  | $ | (1.2) |  |  | $ | 3.8 |  |  | $ | 2.5 |  |  | $ | 1.4 |  |  | $ | 3.9 |
Derivative instrument adjustments | 11.9 |  |  | (0.7) |  |  | 11.2 |  |  | (10.8) |  |  | 1.2 |  |  | (9.6) |  |  | (2.9) |  |  | — |  |  | (2.9) |
Unrealized foreign currency translation adjustments | (23.8) |  |  | (0.6) |  |  | (24.4) |  |  | 11.5 |  |  | 5.0 |  |  | 16.5 |  |  | (2.5) |  |  | 3.4 |  |  | 0.9 |
Total | $ | (3.0) |  |  | $ | (4.1) |  |  | $ | (7.1) |  |  | $ | 5.7 |  |  | $ | 5.0 |  |  | $ | 10.7 |  |  | $ | (2.9) |  |  | $ | 4.8 |  |  | $ | 1.9 |

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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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