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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
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 $ 16.0 $ 16.0
United Kingdom [Member]    
Income Taxes [Line Items]    
Corporate tax rate 19.00%  
Radian [Member]    
Income Taxes [Line Items]    
Foreign tax credits acquired $ 13.0