Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating cash flows from operating leases	$ 8.1	$ 16.1
Operating cash flows from finance leases	0.2	0.4
Financing cash flows from finance leases	0.5	2.6
Right-of-use assets obtained in exchange for Operating Leases	19.4	29.2	$ 0.0
Right-of-use assets obtained in exchange for Finance leases	$ 0.3	$ 1.5	$ 1.1