Leases - Future Minimum Lease Payments Under Finance and Operating Leases (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Finance Leases
2020	$ 0.2	$ 0.3
2021	0.2	0.2
2022	0.0	0.0
2023	0.0	0.0
2024	0.0	0.0
2025 and Thereafter	0.0	0.0
Total Future Payments	0.4	0.5
Less Imputed Interest	0.0	0.0
Present Value of Minimum Lease Payments	0.4	0.5
Operating Leases
2020	16.1	20.5
2021	20.5	19.3
2022	18.9	17.0
2023	16.7	14.7
2024	11.0	8.3
2025 and Thereafter	32.3	28.1
Total Future Payments	115.5	107.9
Less Imputed Interest	15.1	14.7
Present Value of Minimum Lease Payments	$ 100.4	$ 93.2