Schedule 2 - Parent Company Financial Statements - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
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
Parent Company
Condensed Financial Statements, Captions [Line Items]
Due Next 12 Months	2.1
Due Year Two	3.5
Due Year Three	3.7
Due Year Four	3.5
Due Year Five	2.5
Due after Year Five	25.6
Total Future Payments	40.9
Less Discount	9.6
Present Value of Minimum Lease Payments	$ 31.3	$ 0.0