Leases - Aggregate lease maturities 2018 (Details) $ in Millions	Dec. 31, 2018 USD ($)
Finance Leases
2019	$ 1.3
2020	1.3
2021	1.2
2022	0.9
2023	0.4
Total lease payments, Finance leases	5.1
Operating Leases
2019	7.2
2020	5.4
2021	4.7
2022	4.0
2023	2.4
Thereafter	6.5
Total lease payments, Operating leases	30.2
Total Finance and Operating Leases
2019	8.5
2020	6.7
2021	5.9
2022	4.9
2023	2.8
Thereafter	6.5
Total lease payments	$ 35.3