Leases - Minimum Lease Commitments Under Prior Guidance (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Operating leases
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
Minimum commitments for finance leases under prior lease guidance
2020	0.4	0.1
2021	0.2	0.1
2022	0.2
2023	0.1
Total	$ 1.1	$ 0.2