Leases (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets
Operating lease assets	$ 228.0	$ 0.0
Finance lease assets	119.7
Total leased assets	347.7
Current
Operating	33.7	0.0
Finance	5.7
Long-term
Operating	214.3	$ 0.0
Finance	102.8
Total leased liabilities	$ 356.5