Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of beginning and ending balances of unrecognized tax benefits
Unrecognized tax benefits	$ 0.0	$ 0.5
Positions of unrecognized tax benefits, if realized, would impact the effective tax rate		0.3
Accrued interest expense related to uncertain tax positions	0.0	$ 0.0
Federal
Reconciliation of beginning and ending balances of unrecognized tax benefits
Net operating loss carryforwards	9.2
Foreign
Reconciliation of beginning and ending balances of unrecognized tax benefits
Net operating loss carryforwards	9.9
State
Reconciliation of beginning and ending balances of unrecognized tax benefits
Net operating loss carryforwards	$ 86.1