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Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Other Intangible Assets | The following table analyzes other intangible assets movements in the year:
(in millions) |  | 2023 |
Gross cost at January 1 |  | $ | 291.1 |
Additions |  |  | 10.8 |
Exchange effect |  |  | (0.3 | )
Gross cost at September 30 |  |  | 301.6 |
Accumulated amortization at January 1 |  |  | (246.1 | )
Amortization expense |  |  | (8.0 | )
Exchange effect |  |  | 0.3 |
Accumulated amortization at September 30 |  |  | (253.8 | )
Net book amount at September 30 |  | $ | 47.8 |

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