Leases - Future Minimum Lease Payments After the Adoption of ASC 842 (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the three monthes ended March 31, 2019)	$ 21.8
2020	24.9
2021	18.8
2022	14.3
2023	10.0
Thereafter	18.9
Total future minimum lease payments	108.7
Less: imputed interest	(9.6)
Total operating lease liabilities	99.1
Less: current obligations	26.0	$ 0.0
Long-term lease obligation	73.1	$ 0.0
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (excluding the three months ended March 31, 2019)	2.1
2020	2.6
2021	2.5
2022	1.9
2023	1.3
Thereafter	3.0
Total future minimum lease payments	13.4
Less: imputed interest	(2.6)
Total finance lease liabilities	10.8
Less: current obligations	2.1
Long-term lease obligation	$ 8.7