Employee Benefits - Additional information (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Maximum contribution, percentage of compensation	100.00%
Defined contribution plan, employer matching contribution, percent of match	4.00%
Defined contribution plan, cost	$ 0.9	$ 1.0	$ 1.2
Foreign subsidiary contributions and other expenses	$ 1.0	$ 0.7	$ 0.8
First Three Percent Of Participants Deferral
Defined contribution plan, employer matching contribution, percent of employees' gross pay	100.00%
Defined contribution plan, percent of employee deferral eligible for employer matching	3.00%
Next Two Percent Of Participants Deferral
Defined contribution plan, employer matching contribution, percent of employees' gross pay	50.00%
Defined contribution plan, percent of employee deferral eligible for employer matching	2.00%