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Income Taxes - Net Operating Losses and Tax Rates (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net operating losses |  |  |
Statutory Federal income tax rate (as a percent) | 21.00% | 21.00% | 21.00%
Alternative minimum tax credit which does not expire |  | $ 4.4 |
Federal |  |  |
Net operating losses |  |  |
Operating loss carryforward | $ 987.0 | 1,581.1 |
Estimated effective tax rate on net operating losses | 21.00% |  |
State |  |  |
Net operating losses |  |  |
Operating loss carryforward | $ 653.1 | $ 766.4 |
Estimated effective tax rate on net operating losses | 3.45% |  |

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