Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Pension benefit obligations	$ 21.3	$ 18.2
Fair value of plan assets	8.6	7.7
Funded (unfunded) status of plan	(12.7)	(10.5)
Net periodic benefit costs	0.6	0.7	$ 0.9
Compensation expense recognized for 401(k)	$ 39.5	$ 14.9	$ 14.3