Lease Accounting (Leases Reflected on Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets
Operating	$ 128.9	$ 124.2
Finance	2.9	3.0
Total leased assets	131.8	127.2
Current
Operating	6.9	6.8
Finance	1.2	1.2
Noncurrent
Operating	123.4	118.5
Finance	1.1	1.2
Total lease liabilities	132.6	127.7
Accumulated depreciation	$ 2.4	$ 2.2