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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) |  |

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