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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Income Taxes [Line Items]      
Refund of AMT credits recorded as deferred tax asset     $ 12.0
Foreign tax credits acquired $ 36.0 $ 36.0  
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, tax credit realized   $ 23.0  
Realization assessment period   3 years  
Release of uncertain tax position reserves 17.0 $ 17.0  
Interest and penalties related to uncertain tax positions   0.3 1.0
Accrued interest, uncertain tax positions 0.1 0.1 2.0
Unrecognized tax benefits that would impact effective tax rate 0.4 $ 0.4 $ 17.0
Foreign Tax Authority      
Income Taxes [Line Items]      
Corporate tax rate   21.00%  
United Kingdom      
Income Taxes [Line Items]      
Corporate tax rate   19.00%  
France      
Income Taxes [Line Items]      
Corporate tax rate   28.00%  
Radian      
Income Taxes [Line Items]      
Foreign tax credits acquired $ 13.0 $ 13.0