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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Income Taxes [Line Items]      
Realization assessment period 3 years    
Accrued interest and penalties, uncertain tax positions $ 5.8 $ 5.4  
Interest and penalties related to uncertain tax positions 0.4 1.0  
Unrecognized tax benefits that would impact effective tax rate $ 46.0 $ 45.0  
United States [Member]      
Income Taxes [Line Items]      
Corporate tax rate 35.00%    
United Kingdom [Member]      
Income Taxes [Line Items]      
Value added tax rate 20.00%    
Corporate tax rate     21.00%
United Kingdom [Member]      
Income Taxes [Line Items]      
Corporate tax rate 20.00% 20.25%  
Subsequent to April 1, 2015 | United Kingdom [Member]      
Income Taxes [Line Items]      
Corporate tax rate 20.00%    
Radian [Member]      
Income Taxes [Line Items]      
Foreign tax credits acquired $ 11.0