Leases - Lease cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Abstract]
Operating leases	$ 67.7
Short-term leases	45.7
Variable lease costs	73.0
Lease cost	$ 186.4
Rent Expense		$ 48.1	$ 43.1