Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease, extension period	15 years
Operating lease, termination period	1 year
Operating lease cost	$ 22.5	$ 22.1	$ 23.1
Cash paid for operating leases	21.0
ROU assets obtained in exchange for operating lease obligations	$ 13.6
Operating lease, weighted average lease term	8 years 7 months 6 days
Operating lease, discount rate (as a percent)	3.10%