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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Income Taxes [Line Items]        
Realization assessment period 3 years      
Accrued interest and penalties, uncertain tax positions $ 5.2   $ 4.5  
Interest and penalties related to uncertain tax positions 0.7   1.0  
Unrecognized tax benefits that would impact effective tax rate $ 39.0   $ 28.0  
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%   23.00%
United Kingdom [Member]        
Income Taxes [Line Items]        
Corporate tax rate 20.25%   21.50%  
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