Leases - Supplemental Cash Flow Information for Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 19.1	$ 21.2
ROU assets obtained in exchange for operating lease obligations	$ 12.3	$ 9.5
Weighted average remaining lease term	6 years	7 years
Weighted average discount rate (percent)	4.80%	4.90%