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Goodwill and Purchased Intangible Assets - Schedule of Changes in Goodwill (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2022 | Sep. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Changes in goodwill |  |  |  |
Net goodwill at the beginning of the period |  |  | $ 1,042,000,000 | $ 1,049,000,000
Foreign currency translation |  |  | 7,100,000 | (12,300,000)
Acquisitions |  |  | 367,300,000 | 7,400,000
Impairment | $ 0 | $ (2,100,000) |  | (2,100,000)
Net goodwill at the end of the period |  |  | 1,416,400,000 | 1,042,000,000
Access |  |  |  |
Changes in goodwill |  |  |  |
Net goodwill at the beginning of the period |  |  | 865,800,000 | 877,600,000
Foreign currency translation |  |  | 7,100,000 | (11,800,000)
Acquisitions |  |  | 107,000,000 |
Net goodwill at the end of the period |  |  | 979,900,000 | 865,800,000
Defense |  |  |  |
Changes in goodwill |  |  |  |
Net goodwill at the beginning of the period |  |  | 44,400,000 | 44,400,000
Net goodwill at the end of the period |  |  | 44,400,000 | 44,400,000
Vocational |  |  |  |
Changes in goodwill |  |  |  |
Net goodwill at the beginning of the period |  |  | 131,800,000 | 127,000,000
Foreign currency translation |  |  |  | (500,000)
Acquisitions |  |  | 260,300,000 | 7,400,000
Impairment |  |  |  | (2,100,000)
Net goodwill at the end of the period |  |  | $ 392,100,000 | $ 131,800,000

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