Leases - Future Minimum Lease Payments Under Capital and Operating Leases (Details) $ in Millions	Dec. 31, 2018 USD ($)
Capital Leases
2019	$ 0.7
2020	0.7
2021	0.3
2022	0.2
2023	0.0
2024 and Thereafter	0.0
Total Future Payments	1.9
Less Imputed Interest	0.0
Present Value of Minimum Capital Lease Payments	1.9
Operating Leases
2019	20.5
2020	18.4
2021	16.9
2022	15.0
2023	12.5
2024 and Thereafter	27.1
Total Future Payments	$ 110.4