Leases - Supplemental balance sheet information related to leases (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases:
Operating Lease Right-of-Use Asset	$ 202.8
Current operating lease liabilities	54.8
Noncurrent operating lease liabilities	151.5
Operating Lease, Liability, Total	206.3
Finance Leases:
Property, Plant and Equipment	142.1
Accumulated depreciation	(12.2)
Property, Plant and Equipment, net	129.9
Current finance lease liabilities	4.6
Noncurrent finance lease liabilities	129.6
Total	$ 134.2
Weighted Average Remaining Lease Term (Years)
Operating leases	5 years
Finance leases	17 years
Weighted Average Discount Rate
Operating leases	3.57%
Finance leases	5.60%