Leases - Future Minimum Lease Payments After the Adoption of ASC 842 (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the three monthes ended March 31, 2019)	$ 6.4
2020	31.6
2021	26.1
2022	21.3
2023	16.3
Thereafter	28.2
Total future minimum lease payments	129.9
Less: imputed interest	(10.9)
Total operating lease liabilities	119.0
Less: current obligations	27.0	$ 0.0
Long-term lease obligation	92.0	$ 0.0
Finance Lease Liabilities, Payments, Due [Abstract]
2019 (excluding the three months ended March 31, 2019)	0.7
2020	2.7
2021	2.7
2022	2.1
2023	1.4
Thereafter	3.0
Total future minimum lease payments	12.6
Less: imputed interest	(2.3)
Total finance lease liabilities	10.3
Less: current obligations	2.1
Long-term lease obligation	$ 8.2