Accrued Expenses and Other Liabilities - Other liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Other Assets
Other liabilities
Deferred compensation plan assets	$ 2.7	$ 3.2
Other Liabilities
Other liabilities
Deferred compensation plan liabilities	3.1	3.5
Asset retirement obligations	3.2	3.2
Income taxes payable	1.0	1.0
Medical and dental benefits	$ 2.0	$ 2.2