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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Gross cost at January 1 | $ 291.1 |  |
Additions | 10.8 |  |
Exchange effect | (0.3) |  |
Gross cost at September 30 | 301.6 |  | $ 291.1
Accumulated amortization at January 1 | (246.1) |  |
Amortization expense | (8.0) | $ (11.4) |
Exchange effect | 0.3 |  |
Accumulated amortization at September 30 | (253.8) |  |
Net book amount at September 30 | $ 47.8 |  | $ 45.0

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-1 + Details
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