Employee Benefits - Deferred Comp Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Employee Benefits
Period over which matching contributions vest after year 5	9 years
Deferred compensation expense	$ 3.3	$ 2.2	$ 1.8
Other liabilities
Employee Benefits
Liabilities related to deferred comp plan	28.7	25.5
Other assets
Employee Benefits
Assets related to deferred comp plan	$ 24.7	$ 21.1