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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Net intangible assets | $ 297.0 | $ 308.9 | $ 344.9
Intangibles with indefinite useful lives | $ 45.5 | $ 45.5 |

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