Leases - Operating Lease Costs, and Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease cost	$ 12.8	$ 11.6
Short-term and variable lease cost	7.5	6.6
Total lease cost	20.3	18.2
Operating cash outflows - Payments on operating leases	13.0	11.9
Right-of-use asset obtained in exchange for operating lease liabilities	$ 11.3	$ 112.8