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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Apr. 09, 2020
Income Taxes [Line Items]      
Foreign tax credits acquired $ 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    
Interest and penalties related to uncertain tax positions $ 0.2 $ 1.0  
Accrued interest, uncertain tax positions 2.0 2.0  
Unrecognized tax benefits that would impact effective tax rate $ 17.0 $ 17.0  
Subsequent Event [Member]      
Income Taxes [Line Items]      
Refund of AMT credits recorded as deferred tax asset     $ 12.0
Foreign Tax Authority [Member]      
Income Taxes [Line Items]      
Corporate tax rate 21.00%    
United Kingdom [Member]      
Income Taxes [Line Items]      
Corporate tax rate 19.00%    
Radian [Member]      
Income Taxes [Line Items]      
Foreign tax credits acquired $ 13.0