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Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Federal
Operating loss carryforwards
Net operating loss	$ 240.1
Tax credit carryforwards	7.4
Federal | Tax Years 2023 through 2039
Operating loss carryforwards
Net operating loss	150.5
Federal | No expiration
Operating loss carryforwards
Net operating loss	89.6
State
Operating loss carryforwards
Net operating loss	236.7
Tax credit carryforwards	2.4
State | Tax Years 2023 through 2039
Operating loss carryforwards
Net operating loss	$ 236.7

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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