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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 24 Months Ended
Apr. 01, 2017
Mar. 31, 2018
Jun. 30, 2017
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      
Interest and penalties related to uncertain tax positions   $ 0.3   $ 1.0  
Accrued interest and penalties, uncertain tax positions   7.0 $ 37.0    
Accrued interest, uncertain tax positions   2.0   3.0  
Unrecognized tax benefits that would impact effective tax rate   $ 24.0   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