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Employee Benefits - Deferred Comp Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred Comp Plan |  |  |
Period over which matching contributions vest after year 5 | 9 years |  |
Deferred compensation expense | $ 2.2 | $ 1.8 | $ 1.6
Other liabilities |  |  |
Deferred Comp Plan |  |  |
Liabilities related to Deferred Comp Plan | 25.5 | 18.7 |
Other assets |  |  |
Deferred Comp Plan |  |  |
Assets related to Deferred Comp Plan | $ 15.1 | $ 14.1 |

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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