Leases (Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Finance Lease, Right-Of-Use Asset, Accumulated Depreciation	$ 16.1
Lease Assets
Operating ROU assets	193.8	$ 0.0
Finance lease assets	15.9
Total leased assets	209.7
Current:
Operating	45.4
Finance	4.1
Noncurrent:
Operating	150.8	$ 0.0
Finance	10.0
Total leased liabilities	$ 210.3