Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 114.1	$ 0.0
Current operating lease liabilities	27.0	0.0
Non-current Operating Lease Liabilities	92.0	0.0
Total operating lease liabilities	119.0
Finance leases:
Property, at cost	21.1
Less – accumulated depreciation and amortization	12.3
Net property	8.8	$ 8.7
Current obligations of finance leases	2.1
Finance leases, net of current obligations	8.2
Total finance lease liabilities	$ 10.3
Operating Lease, Weighted Average Remaining Lease Term	5 years 1 month
Finance Lease, Weighted Average Remaining Lease Term	5 years 2 months
Operating Lease, Weighted Average Discount Rate, Percent	3.40%
Finance Lease, Weighted Average Discount Rate, Percent	7.00%