Leases - Other Information Related to Leases (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 8.0	$ 40.0
Operating cash flows for finance leases	0.1	0.2
Financing cash flows for finance leases	0.3	0.6
Total cash from leases	$ 8.4	$ 40.8