Leases (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets
Operating lease assets	$ 233.1	$ 0.0
Finance lease assets	119.1
Total lease assets	352.2
Current
Operating	35.1	0.0
Finance	6.0
Long-term
Operating	217.3	$ 0.0
Finance	101.7
Total leased liabilities	$ 360.1