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