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Intangible Assets, Net (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 753.8 |  | $ 748.9
Intangible assets subject to amortization, Accumulated Amortization | (545.9) |  | (536.0)
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | 778.2 |  | 768.2
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,532.0 |  | 1,517.1
Amortization expense for intangible assets | 10.3 | $ 11.8 |
Changes in intangible assets due to foreign currency translation gains (losses) | (1.0) | $ 0.2 |
Summary of estimated aggregate amortization expense for each of the succeeding five years and thereafter |  |  |
2024 (remaining nine months) | 30.6 |  |
2025 | 36.7 |  |
2026 | 27.3 |  |
2027 | 26.6 |  |
2028 | 25.1 |  |
Thereafter | 61.6 |  |
Total | 207.9 |  |
Cooksey Iron & Metal Company |  |  |
Intangible assets |  |  |
Intangible assets recorded in connection with acquisition | 14.1 |  |
Trade names | Cooksey Iron & Metal Company |  |  |
Intangible assets |  |  |
Intangible assets not subject to amortization | $ 8.0 |  |
Customer lists/relationships |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 14 years |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 721.4 |  | 716.0
Intangible assets subject to amortization, Accumulated Amortization | $ (529.8) |  | (520.5)
Backlog of orders |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 7 years 10 months 24 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 22.3 |  | 22.9
Intangible assets subject to amortization, Accumulated Amortization | $ (6.6) |  | (6.0)
Other |  |  |
Intangible assets subject to amortization: |  |  |
Weighted average amortizable life in years | 9 years 4 months 24 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 10.1 |  | 10.0
Intangible assets subject to amortization, Accumulated Amortization | $ (9.5) |  | $ (9.5)

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