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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Gross cost at January 1 | $ 315.1 |  |
Additions | 11.5 |  |
Exchange effect | (2.6) |  |
Gross cost at June 30 | 324.0 |  | $ 315.1
Accumulated amortization at January 1 | (257.8) |  |
Amortization expense | (6.0) | $ (5.3) |
Exchange effect | 1.2 |  |
Accumulated amortization at June 30 | (262.6) |  |
Other intangible assets | $ 61.4 |  | $ 57.3

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