LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Financing arrangements - Credit Facility) (Details) - USD ($) $ in Millions	Jul. 31, 2017	Jun. 30, 2017
Credit Facility
Financing Arrangements
Maximum borrowing capacity		$ 150.0
Additional borrowing capacity that may be requested		75.0
Credit Facility | Subsequent Event
Financing Arrangements
Maximum borrowing capacity	$ 200.0
Additional borrowing capacity that may be requested	100.0
Letters of Credit, Sub-Facility
Financing Arrangements
Maximum borrowing capacity		$ 20.0
Letters of Credit, Sub-Facility | Subsequent Event
Financing Arrangements
Maximum borrowing capacity	$ 20.0