Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 106.8	$ 0.0
Current operating lease liabilities	26.9	0.0
Non-current Operating Lease Liabilities	84.5	0.0
Total operating lease liabilities	111.4
Finance leases:
Property, at cost	21.6
Less – accumulated depreciation and amortization	12.5
Net property	9.1	$ 8.7
Current obligations of finance leases	2.2
Finance leases, net of current obligations	8.5
Total finance lease liabilities	$ 10.7
Operating Lease, Weighted Average Remaining Lease Term	5 years
Finance Lease, Weighted Average Remaining Lease Term	5 years 5 months
Operating Lease, Weighted Average Discount Rate, Percent	3.50%
Finance Lease, Weighted Average Discount Rate, Percent	7.00%