Leases Additional Details (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease, weighted-average remaining lease term	8 years 1 month 6 days
Operating lease, weighted-average discount rate, percent	4.20%
Operating lease, cost	$ 9.5	$ 9.6
Rent expense			$ 5.2
Operating lease, payments	$ 7.2