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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Apr. 01, 2015
Dec. 31, 2015
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]              
Corporate tax rate     35.00%        
Less: Valuation allowance   $ 11.0 $ 11.0   $ 0.0    
Realization assessment period     3 years        
Interest and penalties related to uncertain tax positions     $ 1.0   1.0   $ 1.0
Accrued interest and penalties, uncertain tax positions   $ 5.4 $ 5.4   $ 4.5    
United Kingdom [Member]              
Income Taxes [Line Items]              
Corporate tax rate 20.00%            
Value added tax rate     20.00%        
United Kingdom [Member]              
Income Taxes [Line Items]              
Corporate tax rate   20.00% 20.25% 21.00% 21.50% 23.00%  
Alternative Minimum Tax Credit Carryforward [Member]              
Income Taxes [Line Items]              
Foreign tax credit   $ 55.0 $ 55.0        
Radian [Member]              
Income Taxes [Line Items]              
Less: Valuation allowance   $ 11.0 $ 11.0