Leases - Future Minimum Lease Payments After the Adoption of ASC 842 (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the three monthes ended March 31, 2019)	$ 14.8
2020	29.1
2021	23.2
2022	18.6
2023	13.9
Thereafter	22.2
Total future minimum lease payments	121.8
Less: imputed interest	(10.4)
Total operating lease liabilities	111.4
Less: current obligations	26.9	$ 0.0
Long-term lease obligation	84.5	$ 0.0
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (excluding the three months ended March 31, 2019)	1.4
2020	2.7
2021	2.6
2022	2.0
2023	1.4
Thereafter	3.0
Total future minimum lease payments	13.1
Less: imputed interest	(2.4)
Total finance lease liabilities	10.7
Less: current obligations	2.2
Long-term lease obligation	$ 8.5