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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2015
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):
| June 30, 2015 |  | December 31, 2014
| 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 | 13.8 |  | $ | 311.5 |  |  | $ | 47.1 |  |  | 14.3 |  | $ | 311.5 |  |  | $ | 36.9 |
Trademarks and trade names | 12.9 |  | 21.8 |  |  | 4.1 |  |  | 13.4 |  | 21.8 |  |  | 3.0 |
Other | 1.3 |  | 0.2 |  |  | 0.2 |  |  | 2.2 |  | 0.2 |  |  | 0.1 |
Total intangible assets (excluding goodwill) | 13.8 |  | $ | 333.5 |  |  | $ | 51.4 |  |  | 14.2 |  | $ | 333.5 |  |  | $ | 40.0 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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