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Intangible Assets, net (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 632.6 |  | $ 633.1
Intangible assets subject to amortization, Accumulated Amortization | (433.3) |  | (406.2)
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,352.8 |  | 1,353.3
Amortization expense for intangible assets | 27.5 | $ 30.3 |
Changes in intangible assets due to foreign currency translation gains (losses) | (0.1) | (2.8) |
Summary of estimated aggregate amortization expense for each of the succeeding five years |  |  |
2021 (remaining three months) | 9.0 |  |
2022 | 35.9 |  |
2023 | 31.6 |  |
2024 | 28.1 |  |
2025 | 23.9 |  |
2026 | 14.4 |  |
Trade names |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | $ 720.2 |  | 720.2
Intangible assets |  |  |
Impairment losses of intangible assets, indefinite-lived |  | 67.8 |
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 | $ (0.5) |  | (0.5)
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 | $ 623.2 |  | 623.2
Intangible assets subject to amortization, Accumulated Amortization | $ (424.1) |  | (396.7)
Intangible assets |  |  |
Impairment losses of intangible assets, finite-lived |  | $ 30.7 |
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 | 5 years 1 month 6 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 0.6 |  | 1.1
Intangible assets subject to amortization, Accumulated Amortization | $ (0.6) |  | $ (0.9)

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