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Intangible Assets, net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 720.0 | $ 717.2 |
Intangible assets subject to amortization, Accumulated Amortization | (447.5) | (402.8) |
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,478.6 | 1,474.8 |
Amortization expense for intangible assets | 43.1 | 45.8 | $ 50.6
Changes in intangible assets due to foreign currency translation gains (losses) | 2.2 |  |
Impairment losses of intangible assets, indefinite-lived |  | 16.5 |
Impairment losses of intangible assets, finite-lived |  | 16.7 |
Summary of estimated aggregate amortization expense for each of the succeeding five years |  |  |
2020 | 43.2 |  |
2021 | 41.5 |  |
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 | $ 758.6 | 757.6 |
Intangible assets |  |  |
Impairment losses of intangible assets, indefinite-lived |  | 16.5 |
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 | 0.8 |
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 |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 710.1 | 707.3 |
Intangible assets subject to amortization, Accumulated Amortization | $ (438.1) | (393.4) |
Intangible assets |  |  |
Impairment losses of intangible assets, finite-lived |  | 16.7 |
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 7 months 6 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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