Leases - Lease Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating leases	[1]	$ 43.7
Finance leases
Amortization		3.2
Interest		0.6
Total finance leases		$ 3.8
Operating lease expense			$ 51.2	$ 50.9

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