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Intangible Assets, net (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 719.6 |  | $ 717.2
Intangible assets subject to amortization, Accumulated Amortization | (425.7) |  | (402.8)
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,477.9 |  | 1,474.8
Amortization expense for intangible assets | 21.5 | $ 23.7 |
Changes in intangible assets due to foreign currency translation gains (losses) | 1.7 | $ (2.3) |
Summary of estimated aggregate amortization expense for each of the succeeding five years |  |  |
2019 (remaining six months) | 21.6 |  |
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 | $ 758.3 |  | 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 | $ 709.6 |  | 707.3
Intangible assets subject to amortization, Accumulated Amortization | $ (416.2) |  | (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 6 months |  |
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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