Leases - Schedule of Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease cost	$ 4.9	$ 4.6
Finance lease cost:
Amortization of right-of-use assets	0.2	0.2
Interest on lease liabilities	0.1	0.1
Sublease income	(0.6)	(0.6)
Total lease cost	$ 4.6	$ 4.3