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Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  | 13 years 9 months |  | 14 years 2 months 8 days
Gross Carrying Amount | $ 333.5 |  | $ 333.5 |  | $ 333.5
Accumulated Amortization | 51.4 |  | 51.4 |  | $ 40.0
Intangible assets amortization expense | 5.7 | $ 5.6 | $ 11.4 | $ 11.3 |
Customer Relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  | 13 years 9 months |  | 14 years 3 months
Gross Carrying Amount | 311.5 |  | $ 311.5 |  | $ 311.5
Accumulated Amortization | 47.1 |  | $ 47.1 |  | $ 36.9
Trademarks and Trade Names |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  | 12 years 11 months |  | 13 years 4 months 28 days
Gross Carrying Amount | 21.8 |  | $ 21.8 |  | $ 21.8
Accumulated Amortization | 4.1 |  | $ 4.1 |  | $ 3.0
Other Intangible Assets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted Average Remaining Useful Life (in Years) |  |  | 1 year 3 months |  | 2 years 2 months 12 days
Gross Carrying Amount | 0.2 |  | $ 0.2 |  | $ 0.2
Accumulated Amortization | $ 0.2 |  | $ 0.2 |  | $ 0.1

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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