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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)