Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finance Leases
Due Next 12 Months	$ 0.3	$ 0.7
Due Year Two	0.2	0.7
Due Year Three	0.0	0.3
Due Year Four	0.0	0.2
Due Year Five	0.0	0.0
Due after Year Five	0.0	0.0
Total Future Payments	0.5	1.9
Less Discount	0.0	0.0
Present Value of Minimum Lease Payments	0.5	1.9
Operating Leases
Due Next 12 Months	20.5	20.5
Due Year Two	19.3	18.4
Due Year Three	17.0	16.9
Due Year Four	14.7	15.0
Due Year Five	8.3	12.5
Due after Year Five	28.1	27.1
Total Future Payments	107.9	$ 110.4
Less Discount	14.7
Present Value of Minimum Lease Payments	$ 93.2