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Employee Benefits - Deferred Comp Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee Benefits |  |  |
Period over which matching contributions vest after year 5 | 9 years |  |
Deferred compensation expense | $ 3.1 | $ 3.3 | $ 2.2
Other liabilities |  |  |
Employee Benefits |  |  |
Liabilities related to deferred comp plan | 37.6 | 28.7 |
Other assets |  |  |
Employee Benefits |  |  |
Assets related to deferred comp plan | $ 30.2 | $ 24.7 |

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