Leases - Lease Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating leases	[1]	$ 43.4	$ 43.7
Finance leases
Amortization		4.8	3.2
Interest		0.8	0.6
Total finance leases		$ 5.6	$ 3.8
Operating lease expense				$ 51.2

[1] (1) Includes short-term leases and variable lease costs, which are immaterial