RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Schedule of Postretirement Health Care Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Amounts recorded in the Consolidated Balance Sheets:
Accrued pension benefits, long-term	$ 118.8	$ 76.9
Postretirement Health Care Plan [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	11.2	9.8
Service cost	0.4	0.4
Interest cost	0.4	$ 0.4
Acquired obligation	14.1
Actuarial gain	(0.9)	$ (0.2)
Benefits paid	(0.2)	(0.2)
Retiree contributions	0.1	0.2
Special termination benefits		0.8
Benefit obligation at end of year	25.1	11.2
Amounts recorded in the Consolidated Balance Sheets:
Accrued benefits obligation, current portion	1.8	1.1
Accrued pension benefits, long-term	23.3	10.1
Net amount recognized	$ 25.1	$ 11.2