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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, 2021
Sep. 30, 2020
Amounts recognized in the Consolidated Balance Sheets consist of:    
Noncurrent assets $ 89.9 $ 64.3
Noncurrent liabilities (98.2) (96.2)
U.S. Plan | Defined Benefit Pension Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year 109.8 108.0
Interest cost 1.5 2.6
Actuarial (gain) loss (4.1) 6.4
Benefits paid (7.0) (7.2)
Projected benefit obligation (“PBO”) at end of year 100.2 109.8
Accumulated benefit obligation (“ABO”) at end of year 100.2 109.8
Change in plan assets:    
Fair value of plan assets at beginning of year 81.5 81.3
Actual return on plan assets 5.9 5.1
Employer contribution 1.3 2.3
Benefits paid (7.0) (7.2)
Fair value of plan assets at end of year 81.7 81.5
Unfunded status at end of year (18.5) (28.3)
Information for pension plans with an ABO in excess of plan assets:    
Accumulated benefit obligation 100.2 109.8
Fair value of plan assets 81.7 81.5
Projected benefit obligation 100.2 109.8
Amounts recognized in the Consolidated Balance Sheets consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (0.2) (0.2)
Noncurrent liabilities (18.3) (28.1)
Total amount accrued (18.5) (28.3)
Amounts recognized in AOCL consist of:    
Actuarial loss 39.2 47.9
Total amount recognized 39.2 47.9
Total change in other comprehensive loss attributable to:    
Net gain (loss) during the period 6.6 (5.3)
Reclassification to net income 2.1 1.8
Foreign currency translation 0.0 0.0
Total change in other comprehensive loss $ 8.7 $ (3.5)
Weighted average assumptions used in development of projected benefit obligation:    
Discount rate 2.37% 2.05%
International Plan | Defined Benefit Pension Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year $ 193.7 $ 185.2
Interest cost 2.6 2.7
Actuarial (gain) loss (2.9) 4.0
Benefits paid (7.6) (7.7)
Foreign currency translation 7.8 9.5
Projected benefit obligation (“PBO”) at end of year 193.6 193.7
Accumulated benefit obligation (“ABO”) at end of year 193.6 193.7
Change in plan assets:    
Fair value of plan assets at beginning of year 209.9 196.6
Actual return on plan assets 2.1 3.9
Employer contribution 7.9 7.3
Benefits paid (7.6) (7.7)
Foreign currency translation 9.3 9.8
Fair value of plan assets at end of year 221.6 209.9
Unfunded status at end of year 28.0 16.2
Information for pension plans with an ABO in excess of plan assets:    
Accumulated benefit obligation 16.9 18.3
Fair value of plan assets 0.0 0.0
Projected benefit obligation 16.9 18.3
Amounts recognized in the Consolidated Balance Sheets consist of:    
Noncurrent assets 44.9 34.5
Current liabilities (0.9) (0.9)
Noncurrent liabilities (16.0) (17.4)
Total amount accrued 28.0 16.2
Amounts recognized in AOCL consist of:    
Actuarial loss 51.4 50.2
Prior service cost 2.7 2.6
Total amount recognized 54.1 52.8
Total change in other comprehensive loss attributable to:    
Net gain (loss) during the period (0.6) (7.0)
Reclassification to net income 1.3 1.0
Foreign currency translation (2.0) (2.5)
Total change in other comprehensive loss $ (1.3) $ (8.5)
Weighted average assumptions used in development of projected benefit obligation:    
Discount rate 1.90% 1.51%