Leases - Schedule of Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 4.9	$ 14.3
Finance lease cost:
Amortization of right-of-use assets	0.2	0.6
Interest on lease liabilities	0.0	0.1
Sublease income	(0.6)	(1.7)
Total lease cost	$ 4.5	$ 13.3