Leases - Minimum Lease Commitments Under Prior Guidance (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Operating leases
2019		$ 25.3
2020	$ 20.6	19.1
2021	15.2	13.7
2022	9.7	9.3
2023	7.6	7.3
Thereafter	16.7	18.4
Total	75.7	93.1
Minimum commitments for finance leases under prior lease guidance
2020	0.5	0.1
2021	0.4	0.1
2022	0.3
2023	0.2
Total	$ 1.5	$ 0.2