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Intangible Assets, net (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) item
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 717.2 | $ 760.2 |
Intangible assets subject to amortization, Accumulated Amortization | (402.8) | (405.7) |
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,474.8 | 1,517.8 |
Amortization expense for intangible assets | 45.8 | 50.6 | $ 54.1
Changes in intangible assets due to foreign currency translation losses | (4.1) |  |
Impairment losses of intangible assets, indefinite-lived | 16.5 |  | $ 36.4
Impairment losses of intangible assets, finite-lived | 16.7 |  |
Summary of estimated aggregate amortization expense for each of the succeeding five years |  |  |
2019 | 43.0 |  |
2020 | 43.0 |  |
2021 | 41.3 |  |
2022 | 36.7 |  |
2023 | 30.7 |  |
2018 Acquisitions |  |  |
Intangible assets |  |  |
Intangible assets recorded in connection with our 2018 acquisitions | 43.3 |  |
Trade names |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | $ 757.6 | 757.6 |
Intangible assets |  |  |
Number of intangible assets subject to impairment | item | 1 |  | 8
Impairment losses of intangible assets, indefinite-lived | $ 16.5 |  | $ 36.4
Trade names | 2018 Acquisitions |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | $ 18.3 |  |
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 | $ (0.4) | (0.4) |
Customer lists/relationships |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 14 years 10 months 24 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 707.3 | 745.0 |
Intangible assets subject to amortization, Accumulated Amortization | $ (393.4) | (391.3) |
Intangible assets |  |  |
Number of intangible assets subject to impairment | item | 1 |  |
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 4 months 24 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 1.0 | 6.3 |
Intangible assets subject to amortization, Accumulated Amortization | $ (0.9) | $ (5.9) |

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