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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Gross cost at January 1 | $ 331.9 | $ 315.1 |
Additions | 23.6 | 24.3 |
Exchange effect | 17.8 | (7.5) |
Gross cost at December 31 | 373.3 | 331.9 | $ 315.1
Accumulated amortization at January 1 | (266.5) | (257.8) |
Amortization expense | (11.6) | (12.6) | (10.6)
Impairment | (19.0) | 0.0 |
Exchange effect | (8.5) | 3.9 |
Accumulated amortization at December 31 | (305.6) | (266.5) | $ (257.8)
Net book amount at December 31 | $ 67.7 | $ 65.4 |

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