Employee Benefit Plans - Projected Benefit Obligation and Plan Asset Fund Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$ 62.5	$ 58.5
Interest cost	1.7	1.8	$ 2.2
Assumption changes	(1.9)	5.2
Acquisition of Hudson Plan	3.1	0.0
Benefits paid	(2.8)	(2.7)
Actuarial losses (gains)	0.9	(0.3)
Projected benefit obligation at year end	63.5	62.5	58.5
Change in plan assets:
Fair value of plan assets at beginning of year	53.9	49.1
Actual return	8.3	6.4
Acquisition of Hudson Plan	2.4	0.0
Employer contributions	0.1	1.1
Benefits paid	(2.8)	(2.7)
Fair value of plan assets at year end	61.9	53.9	$ 49.1
Funded status (Accrued pension liabilities)	(1.6)	(8.6)
Unrecognized actuarial loss recognized in accumulated other comprehensive income (loss)	$ 8.0	$ 14.9