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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax | 23.30% | 14.00% | 22.40% | 19.60% |
Deferred tax assets, net | $ 19.9 |  | $ 19.9 |  | $ 32.7
Gross unrecognized tax benefits | 23.9 |  | 23.9 |  | 30.9
Accrued interest and penalties on unrecognized tax benefits | $ 4.0 |  | $ 4.0 |  | $ 2.8
Tax benefit, extension of federal energy efficient homes tax credits |  | $ (53.2) |  | $ (58.0) |

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