Leases (Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Lease Assets
Operating ROU assets	$ 178.7	$ 187.3
Finance lease assets	18.1	19.1
Total leased assets	196.8	206.4
Current:
Operating	42.7	42.3
Finance	4.1	4.5
Noncurrent:
Operating	140.6	148.6
Finance	11.4	12.0
Total leased liabilities	198.8	207.4
Finance lease, right-of-use asset, accumulated depreciation	$ 14.4	$ 15.2