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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended 24 Months Ended
Apr. 01, 2017
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Income Taxes [Line Items]            
Foreign tax credits acquired       $ 43.0    
Tax Cuts and Jobs Act of 2017, incomplete accounting, transition tax for accumulated foreign earnings, tax credit realized       $ 30.0    
Realization assessment period       3 years    
Accrued interest and penalties, uncertain tax positions   $ 7.0 $ 37.0      
Interest and penalties related to uncertain tax positions       $ 0.7 $ 1.0  
Accrued interest, uncertain tax positions       3.0 3.0  
Unrecognized tax benefits that would impact effective tax rate       $ 25.0 31.0  
United Kingdom [Member]            
Income Taxes [Line Items]            
Corporate tax rate 19.00%     19.00%   20.00%
Value added tax rate, percent       20.00%    
United States [Member]            
Income Taxes [Line Items]            
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional income tax expense (benefit)         $ 61.0  
Radian [Member]            
Income Taxes [Line Items]            
Foreign tax credits acquired       $ 13.0