Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Operating leases
2019 (excluding the six months ended June 30, 2019)	$ 12.2
2019		$ 25.3
2020	20.2	19.1
2021	14.7	13.7
2022	9.7	9.3
2023	7.8	7.3
Thereafter	17.2	18.4
Total	81.8	93.1
Less: Imputed interest	(4.9)
Total lease liabilities	76.9
Finance leases
2019 (excluding the six months ended June 30, 2019)	0.2
2020	0.4	0.1
2021	0.2	0.1
2022	0.2
2023	0.1
Total	1.1	$ 0.2
Imputed interest	(0.1)
Total lease liabilities	$ 1.0