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RETIREMENT PLANS - Benefit Obligations, Plan Assets, Annual Expense, Assumptions and Other Information of the Company's Defined Benefit Pension Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Amounts recognized in the Consolidated Balance Sheets consist of:    
Non-current assets $ 64.1 $ 69.6
Non-current liabilities (76.7) (82.1)
International Plan | Defined Benefit Pension Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year 109.2 193.6
Interest cost 6.2 3.0
Actuarial gain (11.0) (55.1)
Benefits paid (5.9) (7.5)
Foreign currency translation 10.0 (24.8)
Projected benefit obligation (“PBO”) at end of year 108.5 109.2
Accumulated benefit obligation (“ABO”) at end of year 108.5 109.2
Change in plan assets:    
Fair value of plan assets at beginning of year 128.9 221.6
Actual return on plan assets (11.5) (61.2)
Employer contribution 1.2 5.3
Benefits paid (5.9) (7.5)
Foreign currency translation 12.1 (29.3)
Fair value of plan assets at end of year 124.8 128.9
Unfunded status at end of year 16.3 19.7
Information for pension plans with an ABO in excess of plan assets:    
Accumulated benefit obligation 11.5 11.6
Fair value of plan assets 0.0 0.0
Projected benefit obligation 11.5 11.6
Amounts recognized in the Consolidated Balance Sheets consist of:    
Non-current assets 27.8 31.3
Current liabilities (0.9) (0.8)
Non-current liabilities (10.6) (10.8)
Total amount accrued 16.3 19.7
Amounts recognized in AOCL consist of:    
Actuarial loss 60.0 51.2
Prior service cost 2.1 2.1
Total amount recognized 62.1 53.3
Total change in other comprehensive loss attributable to:    
Net gain (loss) during the period (6.0) (11.1)
Reclassification to net earnings 2.0 1.3
Foreign currency translation (4.8) 10.6
Total change in other comprehensive loss $ (8.8) $ 0.8
Weighted average assumptions used in development of projected benefit obligation:    
Discount rate 5.38% 4.96%
U.S. Plan | Defined Benefit Pension Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year $ 77.7 $ 100.2
Interest cost 3.6 1.7
Actuarial gain (2.5) (17.2)
Benefits paid (6.9) (7.0)
Foreign currency translation 0.0 0.0
Projected benefit obligation (“PBO”) at end of year 71.8 77.7
Accumulated benefit obligation (“ABO”) at end of year 71.8 77.7
Change in plan assets:    
Fair value of plan assets at beginning of year 59.1 81.7
Actual return on plan assets 1.7 (15.8)
Employer contribution 0.2 0.2
Benefits paid (6.9) (7.0)
Foreign currency translation 0.0 0.0
Fair value of plan assets at end of year 54.1 59.1
Unfunded status at end of year (17.7) (18.6)
Information for pension plans with an ABO in excess of plan assets:    
Accumulated benefit obligation 71.8 77.7
Fair value of plan assets 54.1 59.1
Projected benefit obligation 71.8 77.7
Amounts recognized in the Consolidated Balance Sheets consist of:    
Non-current assets 0.0 0.0
Current liabilities (0.2) (0.2)
Non-current liabilities (17.5) (18.4)
Total amount accrued (17.7) (18.6)
Amounts recognized in AOCL consist of:    
Actuarial loss 35.2 38.8
Prior service cost 0.0 0.0
Total amount recognized 35.2 38.8
Total change in other comprehensive loss attributable to:    
Net gain (loss) during the period 1.8 (1.3)
Reclassification to net earnings 1.8 1.7
Foreign currency translation 0.0 0.0
Total change in other comprehensive loss $ 3.6 $ 0.4
Weighted average assumptions used in development of projected benefit obligation:    
Discount rate 5.54% 5.06%