Lease Accounting (Leases Reflected on Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Operating (Right-of-use)	$ 146.3	$ 124.2
Finance	2.6	3.0
Total leased assets	148.9	127.2
Current
Operating	7.7	6.8
Finance	1.2	1.2
Noncurrent
Operating	140.7	118.5
Finance	0.9	1.2
Total lease liabilities	150.5	127.7
Accumulated depreciation	$ 2.7	$ 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