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EMPLOYEE BENEFIT PLANS - Pension Plans Narrative (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Defined Benefit Plan [Abstract]    
Estimated cash contributions $ 16.3  
Cash contributions 12.7  
Weighted-average expected long-term rate of return on assets   3.60%
Increase (Decrease) in Obligation, Pension Benefits $ 2.9  
Unequal Guaranteed Minimum Pension Ruling, Period, Additional Expense Amortization 20 years