Leases - Position of Leases (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets
Operating lease assets	$ 64.7	$ 0.0
Finance lease assets	25.8
Total lease assets	90.5
Current
Operating	11.9	0.0
Finance	6.7
Noncurrent
Operating	54.1	$ 0.0
Finance	10.8
Total lease liabilities	$ 83.5
Weighted-average remaining lease term (in years)
Operating leases	7 years 2 months 28 days
Finance leases	4 years 10 days
Weighted-average discount rate
Operating leases	5.30%
Finance leases	3.80%