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Intangible Assets, net (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 747.3 |  | $ 674.7
Intangible assets subject to amortization, Accumulated Amortization | (327.9) |  | (299.6)
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,533.2 |  | 1,425.0
Amortization expense for intangible assets | 27.1 | $ 27.7 |
Changes in intangible assets due to foreign currency translation gains | 3.6 |  |
Summary of estimated aggregate amortization expense for the remaining six months of 2016 and each of the succeeding five years |  |  |
2016 | 26.7 |  |
2017 | 49.8 |  |
2018 | 45.4 |  |
2019 | 45.3 |  |
2020 | 45.3 |  |
2021 | 41.4 |  |
2016 Acquisitions |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets recorded in connection with our 2016 acquisitions | 34.1 |  |
Intangible assets |  |  |
Intangible assets recorded in connection with our 2016 acquisitions | 103.4 |  |
Trade names |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | 785.9 |  | 750.3
Trade names | 2016 Acquisitions |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets recorded in connection with our 2016 acquisitions | $ 34.1 |  |
Covenants not to compete |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 4 years 6 months |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 1.5 |  | 1.3
Intangible assets subject to amortization, Accumulated Amortization | $ (1.1) |  | (1.0)
Customer lists/relationships |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 14 years 9 months 18 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 731.4 |  | 659.0
Intangible assets subject to amortization, Accumulated Amortization | $ (313.2) |  | (285.7)
Software - internal use |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 10 years |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 8.1 |  | 8.1
Intangible assets subject to amortization, Accumulated Amortization | $ (8.1) |  | (7.9)
Other |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 5 years 2 months 12 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 6.3 |  | 6.3
Intangible assets subject to amortization, Accumulated Amortization | $ (5.5) |  | $ (5.0)

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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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