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INCOME TAXES Tax Cuts and Jobs Act (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]        
Effective income tax rate   31.50%    
Tax Cuts And Jobs Act Of 2017, transition tax   $ 471.6    
Tax Cuts And Jobs Act Of 2017, effect of change on earnings per share, diluted (in usd per share)   $ 1.89    
Repatriation of foreign earnings   $ 653.7 $ 0.0 $ 0.0
Tax Cuts And Jobs Act Of 2017, provisional income tax expense (benefit) $ 644.7      
Tax Cuts And Jobs Act Of 2017, Change in tax rate, provisional income tax expense 9.0      
Tax Cuts And Jobs Act Of 2017, provisional income tax benefit $ 136.7      
Tax Cuts And Jobs Act Of 2017, provisional amount recorded for valuation allowance release   $ (36.4)