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Intangible Assets, net (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 706.8 |  | $ 712.3
Intangible assets subject to amortization, Accumulated Amortization | (286.5) |  | (262.6)
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,482.4 |  | 1,490.0
Amortization expense for intangible assets | 27.7 | $ 28.2 |
Changes in intangible assets due to foreign currency translation losses | 4.7 |  |
Summary of estimated aggregate amortization expense for the remaining six months of 2015 and each of the next five years |  |  |
2015 | 26.7 |  |
2016 | 52.0 |  |
2017 | 47.7 |  |
2018 | 43.4 |  |
2019 | 43.3 |  |
2020 | 43.3 |  |
Trade names |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | 775.6 |  | 777.7
Covenants not to compete |  |  |
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | 1.4 |  | 2.3
Intangible assets subject to amortization, Accumulated Amortization | $ (0.9) |  | (1.7)
Weighted average amortizable life in years | 4 years 4 months 24 days |  |
Customer lists/relationships |  |  |
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 690.9 |  | 694.7
Intangible assets subject to amortization, Accumulated Amortization | $ (273.7) |  | (249.3)
Weighted average amortizable life in years | 14 years 2 months 12 days |  |
Software - internal use |  |  |
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 8.1 |  | 8.1
Intangible assets subject to amortization, Accumulated Amortization | $ (7.5) |  | (7.1)
Weighted average amortizable life in years | 10 years |  |
Other |  |  |
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 6.4 |  | 7.2
Intangible assets subject to amortization, Accumulated Amortization | $ (4.4) |  | $ (4.5)
Weighted average amortizable life in years | 5 years 4 months 24 days |  |

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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=31042434&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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