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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Gross cost at January 1 | $ 315.1 |  |
Additions | 3.6 |  |
Exchange effect | (1.2) |  |
Gross cost at March 31 | 317.5 |  | $ 315.1
Accumulated amortization at January 1 | (257.8) |  |
Amortization expense | (2.8) | $ (2.7) |
Exchange effect | 0.8 |  |
Accumulated amortization at March 31 | (259.8) |  |
Net book amount at March 31 | $ 57.7 |  | $ 57.3

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