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Employee Benefits - Deferred Comp Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Comp Plan |  |  |
Period over which matching contributions vest after year 5 | 9 years |  |
Deferred compensation expense | $ 4.7 | $ 3.4 | $ 2.4
Other liabilities |  |  |
Deferred Comp Plan |  |  |
Liabilities related to Deferred Comp Plan | 13.2 | 8.8 |
Other assets |  |  |
Deferred Comp Plan |  |  |
Assets related to Deferred Comp Plan | $ 8.2 | $ 5.9 |

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