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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Components of Intangible Assets | The weighted average remaining useful life, gross carrying amount, and accumulated amortization of our intangible assets were as follows (dollars in millions):
|  | September 30, 2021 |  |  | December 31, 2020 |
|  | Weighted Average Remaining Useful Life (in Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Weighted Average Remaining Useful Life (in Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Customer relationships |  |  | 8.4 |  |  | $ | 503.8 |  |  | $ | 246.2 |  |  |  | 9.1 |  |  | $ | 503.8 |  |  | $ | 220.2 |
Trademarks and trade names |  |  | 9.3 |  |  |  | 34.8 |  |  |  | 24.8 |  |  |  | 9.3 |  |  |  | 34.8 |  |  |  | 23.0 |
Other |  |  | 0.9 |  |  |  | 4.3 |  |  |  | 4.2 |  |  |  | 1.2 |  |  |  | 4.3 |  |  |  | 3.8 |
Total intangible assets (excluding goodwill) |  |  | 8.5 |  |  | $ | 542.9 |  |  | $ | 275.2 |  |  |  | 9.1 |  |  | $ | 542.9 |  |  | $ | 247.0 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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