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ASSOCIATE MEDICAL BENEFITS - Retiree Medical Plan for Domestic Associates (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Amounts recognized in the Consolidated Balance Sheets consist of:    
Noncurrent liabilities $ (98.2) $ (96.2)
Postretirement Medical Benefits | U.S. Plan    
Change in projected benefit obligation:    
Benefit obligation at beginning of year 22.4 22.8
Service cost 0.2 0.2
Interest cost 0.4 0.6
Plan participants’ contributions 0.4 0.4
Actuarial (gain) loss (0.8) 0.7
Benefits paid (2.4) (2.3)
Projected benefit obligation (“PBO”) at end of year 20.1 22.4
Change in plan assets:    
Fair value of plan assets at beginning of year 0.0 0.0
Employer contribution 2.0 1.9
Plan participants’ contributions 0.4 0.4
Gross benefits paid (2.4) (2.3)
Fair value of plan assets at end of year 0.0 0.0
Unfunded status at end of year (20.1) (22.4)
Amounts recognized in the Consolidated Balance Sheets consist of:    
Current liabilities (1.5) (1.6)
Noncurrent liabilities (18.6) (20.8)
Total amount accrued (20.1) (22.4)
Amounts recognized in AOCL consist of:    
Actuarial loss 2.5 3.6
Prior service credit (1.4) (2.5)
Total amount recognized 1.1 1.1
Total change in other comprehensive loss attributable to:    
Gain (loss) during the period 0.8 (0.7)
Reclassification to net income (0.8) (0.9)
Total change in other comprehensive loss $ 0.0 $ (1.6)
Discount rate used in development of APBO 2.66% 2.48%