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Intangible Assets, net (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 690.0 |  | $ 720.0
Intangible assets subject to amortization, Accumulated Amortization | (454.8) |  | (447.5)
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,382.8 |  | 1,478.6
Amortization expense for intangible assets | 10.8 | $ 10.8 |
Changes in intangible assets due to foreign currency translation gains (losses) | (3.5) | $ 1.2 |
Summary of estimated aggregate amortization expense for each of the succeeding five years |  |  |
2020 (remaining nine months) | 26.4 |  |
2021 | 34.7 |  |
2022 | 34.0 |  |
2023 | 29.7 |  |
2024 | 26.2 |  |
Trade names |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | 692.8 |  | 758.6
Intangible assets |  |  |
Impairment losses of intangible assets, indefinite-lived | $ 64.1 |  |
Covenants not to compete |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 5 years |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 0.7 |  | 0.7
Intangible assets subject to amortization, Accumulated Amortization | $ (0.4) |  | (0.4)
Customer lists/relationships |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 15 years 6 months |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 680.2 |  | 710.1
Intangible assets subject to amortization, Accumulated Amortization | (445.4) |  | (438.1)
Intangible assets |  |  |
Impairment losses of intangible assets, finite-lived | $ 24.7 |  |
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 2 months 12 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 1.0 |  | 1.1
Intangible assets subject to amortization, Accumulated Amortization | $ (0.9) |  | $ (0.9)

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