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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Gross cost at January 1 | $ 295.2 | $ 298.9 |
Additions | 2.7 | 0.0 |
Written down in the year | (4.1) | 0.0 |
Exchange effect | (2.7) | (3.7) |
Gross cost at December 31 | 291.1 | 295.2 | $ 298.9
Accumulated amortization at January 1 | (237.7) | (223.6) |
Amortization expense | (14.0) | (16.0) | (20.9)
Written down in the year | 4.1 | 0.0 |
Exchange effect | 1.5 | 1.9 |
Accumulated amortization at December 31 | (246.1) | (237.7) | $ (223.6)
Net book amount at December 31 | $ 45.0 | $ 57.5 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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