EMPLOYEE BENEFIT PLANS - Additional Information on Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Changes in benefit obligation:
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Income (Expense), Net	Interest Income (Expense), Net
Changes in plan assets:
Fair value of plan assets, beginning of year	$ 143.4
Fair value of plan assets, end of year	151.7	$ 143.4
Amounts recognized in statement of financial position
Deferred charges and other	31.8	38.7
Other long-term liabilities	158.0	57.8
Accumulated other comprehensive loss	$ (249.4)	(303.1)
Weighted average assumptions
Defined Benefit Plan, Type [Extensible Enumeration]	Pension Plan [Member]
U.S. Plans
Changes in benefit obligation:
Benefit obligation, beginning of year	$ 53.5	71.4
Service cost	0.6	0.5	$ 0.5
Interest cost	2.8	1.9	1.8
Actuarial gain	(1.7)	(16.1)
Benefits paid	(4.3)	(4.2)
Foreign currency exchange rate changes	0.0	0.0
Benefit obligation, end of year	50.9	53.5	71.4
Changes in plan assets:
Fair value of plan assets, beginning of year	50.3	69.6
Actual return on plan assets	2.9	(15.2)
Employer contributions	0.1	0.1
Benefits paid	(4.3)	(4.2)
Foreign currency exchange rate changes	0.0	0.0
Fair value of plan assets, end of year	49.0	50.3	69.6
Funded Status	(1.9)	(3.2)
Amounts recognized in statement of financial position
Deferred charges and other	0.0	0.0
Other accrued expenses	0.1	0.1
Other long-term liabilities	1.8	3.1
Accumulated other comprehensive loss	$ 9.4	$ 10.9
Weighted average assumptions
Discount rate	5.72%	5.37%
Non U.S. Plans
Changes in benefit obligation:
Benefit obligation, beginning of year	$ 101.1	$ 176.1
Service cost	0.8	1.2	1.5
Interest cost	4.6	2.1	2.1
Actuarial gain	(4.5)	(45.7)
Benefits paid	(4.2)	(4.4)
Foreign currency exchange rate changes	8.7	(28.2)
Benefit obligation, end of year	106.5	101.1	176.1
Changes in plan assets:
Fair value of plan assets, beginning of year	93.1	147.4
Actual return on plan assets	(1.1)	(30.1)
Employer contributions	6.8	4.8
Benefits paid	(4.2)	(4.4)
Foreign currency exchange rate changes	8.1	(24.6)
Fair value of plan assets, end of year	102.7	93.1	$ 147.4
Funded Status	(3.8)	(8.0)
Amounts recognized in statement of financial position
Deferred charges and other	9.6	4.6
Other accrued expenses	0.0	0.0
Other long-term liabilities	13.4	12.6
Accumulated other comprehensive loss	$ 23.8	$ 21.8
Weighted average assumptions
Rate of compensation increase	2.75%	2.75%
Minimum | Non U.S. Plans
Weighted average assumptions
Discount rate	4.00%	3.70%
Maximum | Non U.S. Plans
Weighted average assumptions
Discount rate	5.20%	5.20%