Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating Lease expense	$ 36.0	$ 36.6
Amortization of right-of-use assets on finance leases	1.5	1.2
Total lease expense	$ 37.5	$ 37.8