Lease Accounting (Leases Reflected on Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets
Operating (Right-of-use)	$ 142.1	$ 124.2
Finance	2.9	3.0
Total leased assets	145.0	127.2
Current
Operating	7.5	6.8
Finance	1.2	1.2
Noncurrent
Operating	136.3	118.5
Finance	1.2	1.2
Total lease liabilities	146.2	127.7
Accumulated depreciation	$ 2.5	$ 2.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet