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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, 2024
Sep. 30, 2023
Amounts recognized in the Consolidated Balance Sheets consist of:    
Non-current assets $ 62.7 $ 64.1
Non-current liabilities (73.0) (76.7)
International Plan | Defined Benefit Pension Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year 108.5 109.2
Interest cost 5.9 6.2
Actuarial (gain) loss 5.1 (11.0)
Benefits paid (6.6) (5.9)
Foreign currency translation 10.3 10.0
Projected benefit obligation (“PBO”) at end of year 123.2 108.5
Accumulated benefit obligation (“ABO”) at end of year 123.2 108.5
Change in plan assets:    
Fair value of plan assets at beginning of year 124.8 128.9
Actual return on plan assets 10.0 (11.5)
Employer contribution 0.9 1.2
Benefits paid (6.6) (5.9)
Foreign currency translation 12.3 12.1
Fair value of plan assets at end of year 141.4 124.8
Overfunded (underfunded) status at end of year 18.2 16.3
Information for pension plans with an ABO in excess of plan assets:    
Accumulated benefit obligation 12.0 11.5
Fair value of plan assets 0.0 0.0
Projected benefit obligation 12.0 11.5
Amounts recognized in the Consolidated Balance Sheets consist of:    
Non-current assets 30.2 27.8
Current liabilities (0.9) (0.9)
Non-current liabilities (11.1) (10.6)
Total amount accrued 18.2 16.3
Amounts recognized in AOCL consist of:    
Actuarial loss 64.1 60.0
Prior service cost 2.3 2.1
Total amount recognized 66.4 62.1
Total change in other comprehensive loss attributable to:    
Net gain (loss) during the period (0.7) (6.0)
Reclassification to net earnings 2.3 2.0
Foreign currency translation (5.9) (4.8)
Total change in other comprehensive loss $ (4.3) $ (8.8)
Weighted average assumptions used in development of projected benefit obligation:    
Discount rate 4.86% 5.38%
U.S. Plan | Defined Benefit Pension Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year $ 71.8 $ 77.7
Interest cost 3.7 3.6
Actuarial (gain) loss 5.5 (2.5)
Benefits paid (6.8) (6.9)
Foreign currency translation 0.0 0.0
Projected benefit obligation (“PBO”) at end of year 74.2 71.8
Accumulated benefit obligation (“ABO”) at end of year 74.2 71.8
Change in plan assets:    
Fair value of plan assets at beginning of year 54.1 59.1
Actual return on plan assets 7.1 1.7
Employer contribution 2.9 0.2
Benefits paid (6.8) (6.9)
Foreign currency translation 0.0 0.0
Fair value of plan assets at end of year 57.3 54.1
Overfunded (underfunded) status at end of year (16.9) (17.7)
Information for pension plans with an ABO in excess of plan assets:    
Accumulated benefit obligation 74.2 71.8
Fair value of plan assets 57.3 54.1
Projected benefit obligation 74.2 71.8
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 (16.7) (17.5)
Total amount accrued (16.9) (17.7)
Amounts recognized in AOCL consist of:    
Actuarial loss 34.1 35.2
Prior service cost 0.0 0.0
Total amount recognized 34.1 35.2
Total change in other comprehensive loss attributable to:    
Net gain (loss) during the period (0.5) 1.8
Reclassification to net earnings 1.7 1.8
Foreign currency translation 0.0 0.0
Total change in other comprehensive loss $ 1.2 $ 3.6
Weighted average assumptions used in development of projected benefit obligation:    
Discount rate 4.62% 5.54%