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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