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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Components of Accumulated Other Comprehensive Loss | Components of Accumulated other comprehensive (loss) income were as follows ($ in millions):
| December 31,
| 2020 |  | 2019
Accumulated pension and OPEB liability adjustments, net of income tax benefit of $11.6 million and $12.8 million at December 31, 2020 and 2019, respectively | $ | (20.5) |  |  | $ | (24.3) |
Accumulated unrealized loss on derivative instruments, net of income tax benefit of $2.8 million and $1.6 million at December 31, 2020 and 2019, respectively | (13.1) |  |  | (3.5) |
Accumulated unrealized foreign currency translation adjustments, net of income tax benefit of $10.1 million and $5.0 million at December 31, 2020 and 2019, respectively | (78.3) |  |  | (94.8) |
Accumulated other comprehensive loss | $ | (111.9) |  |  | $ | (122.6) |
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,
| 2020 |  | 2019 |  | 2018
| Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax |  | Pre-tax |  | Tax |  | Net of Tax
Pension and OPEB liability adjustments | $ | 5.0 |  |  | $ | (1.2) |  |  | $ | 3.8 |  |  | $ | 2.5 |  |  | $ | 1.4 |  |  | $ | 3.9 |  |  | $ | (0.9) |  |  | $ | (2.4) |  |  | $ | (3.3) |
Derivative instrument adjustments | (10.8) |  |  | 1.2 |  |  | (9.6) |  |  | (2.9) |  |  | — |  |  | (2.9) |  |  | (2.4) |  |  | 1.4 |  |  | (1.0) |
Unrealized foreign currency translation adjustments | 11.5 |  |  | 5.0 |  |  | 16.5 |  |  | (2.5) |  |  | 3.4 |  |  | 0.9 |  |  | (28.0) |  |  | (2.8) |  |  | (30.8) |
Total | $ | 5.7 |  |  | $ | 5.0 |  |  | $ | 10.7 |  |  | $ | (2.9) |  |  | $ | 4.8 |  |  | $ | 1.9 |  |  | $ | (31.3) |  |  | $ | (3.8) |  |  | $ | (35.1) |

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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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