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Intangible Assets, net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Intangible assets subject to amortization: |  |  |  |
Intangible assets subject to amortization, Gross Carrying Amount |  | $ 718.7 |  | $ 717.2
Intangible assets subject to amortization, Accumulated Amortization |  | (435.9) |  | (402.8)
Intangible assets |  |  |  |
Intangible assets, Gross Carrying Amount |  | 1,476.6 |  | 1,474.8
Amortization expense for intangible assets |  | 32.3 | $ 35.1 |
Changes in intangible assets due to foreign currency translation gains (losses) |  | 1.0 | (1.5) |
Impairment losses of intangible assets | $ 16.5 |  | $ 16.7 |
Summary of estimated aggregate amortization expense for each of the succeeding five years |  |  |  |
2019 (remaining three months) |  | 10.8 |  |
2020 |  | 43.1 |  |
2021 |  | 41.4 |  |
2022 |  | 36.7 |  |
2023 |  | 30.7 |  |
2024 |  | 27.2 |  |
Trade names |  |  |  |
Intangible assets not subject to amortization: |  |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount |  | $ 757.9 |  | 757.6
Covenants not to compete |  |  |  |
Intangible assets subject to amortization: |  |  |  |
Weighted average amortizable life in years |  | 4 years 9 months 18 days |  |
Intangible assets subject to amortization, Gross Carrying Amount |  | $ 0.8 |  | 0.8
Intangible assets subject to amortization, Accumulated Amortization |  | $ (0.5) |  | (0.4)
Customer lists/relationships |  |  |  |
Intangible assets subject to amortization: |  |  |  |
Weighted average amortizable life in years |  | 15 years |  |
Intangible assets subject to amortization, Gross Carrying Amount |  | $ 708.7 |  | 707.3
Intangible assets subject to amortization, Accumulated Amortization |  | $ (426.4) |  | (393.4)
Software |  |  |  |
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) |  | (8.1)
Other |  |  |  |
Intangible assets subject to amortization: |  |  |  |
Weighted average amortizable life in years |  | 7 years 3 months 18 days |  |
Intangible assets subject to amortization, Gross Carrying Amount |  | $ 1.1 |  | 1.0
Intangible assets subject to amortization, Accumulated Amortization |  | $ (0.9) |  | $ (0.9)

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the sixth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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