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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Gross cost at January 1 | $ 291.1 |  |
Additions | 6.7 |  |
Exchange effect | 1.2 |  |
Gross cost at June 30 | 299.0 |  | $ 291.1
Accumulated amortization at January 1 | (246.1) |  |
Amortization expense | (5.3) | $ (7.8) |
Exchange effect | (0.9) |  |
Accumulated amortization at June 30 | (252.3) |  |
Net book amount at June 30 | $ 46.7 |  | $ 45.0

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