Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Assets Contributed to 401k Plan				$ 7.9
Restricted investments	$ 1.2	$ 2.4
401(k) Plan distribution period (in years)	1 year
Compensation expense for assets allocated to participants	$ 1.2	1.1	$ 1.1
Restricted | Maximum
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Gain (loss) on assets	$ 0.1	$ (0.1)	$ (0.1)