Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2023 USD ($)
Federal
Operating loss carryforwards
Net operating loss	$ 314.4
Federal | Tax Years 2028 Through 2042
Operating loss carryforwards
Net operating loss	150.6
Tax credit carryforwards	11.8
Federal | No expiration
Operating loss carryforwards
Net operating loss	163.8
State
Operating loss carryforwards
Net operating loss	312.0
State | Tax Years 2028 Through 2042
Operating loss carryforwards
Net operating loss	312.0
Tax credit carryforwards	$ 3.5