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LONG-TERM DEBT LONG-TERM DEBT (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Mar. 31, 2017
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 2%    
Disclosure of detailed information about borrowings [line items]    
Maximum borrowing capacity $ 1,000 $ 1,000
Revolving long-term bank credit facility, interest at variable U.S. LIBOR-based interest rate plus a spread ranging from 1% to 1.25%    
Disclosure of detailed information about borrowings [line items]    
Maximum borrowing capacity $ 300 $ 300