XML 86 R68.htm IDEA: XBRL DOCUMENT v3.24.3
Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Goodwill [Line Items]      
Goodwill $ 4,700.7 $ 4,574.4  
Operating Segments      
Goodwill [Line Items]      
Goodwill (gross) 5,400.7 5,274.4 $ 5,007.4
Accumulated impairment losses (700.0) (700.0) (657.8)
Goodwill 4,700.7 4,574.4 4,349.6
Goodwill acquired 43.2 194.2  
Goodwill, Impairment Loss   (42.2)  
Currency translation adjustment 83.1 72.8  
Operating Segments | Post Consumer Brands Segment      
Goodwill [Line Items]      
Goodwill (gross) 2,304.3 2,261.1 2,066.8
Accumulated impairment losses (609.1) (609.1) (609.1)
Goodwill 1,695.2 1,652.0 1,457.7
Goodwill acquired 43.2 194.2  
Currency translation adjustment 0.0 0.1  
Operating Segments | Weetabix Segment      
Goodwill [Line Items]      
Goodwill (gross) 937.4 854.3 781.6
Accumulated impairment losses 0.0 0.0 0.0
Goodwill 937.4 854.3 781.6
Goodwill acquired 0.0 0.0  
Currency translation adjustment 83.1 72.7  
Operating Segments | Foodservice Segment      
Goodwill [Line Items]      
Goodwill (gross) 1,355.3 1,355.3 1,355.3
Accumulated impairment losses 0.0 0.0 0.0
Goodwill 1,355.3 1,355.3 1,355.3
Goodwill acquired 0.0 0.0  
Currency translation adjustment 0.0 0.0  
Operating Segments | Refrigerated Retail Segment      
Goodwill [Line Items]      
Goodwill (gross) 803.7 803.7 803.7
Accumulated impairment losses (90.9) (90.9) (48.7)
Goodwill 712.8 712.8 $ 755.0
Goodwill acquired 0.0 0.0  
Goodwill, Impairment Loss   (42.2)  
Currency translation adjustment $ 0.0 $ 0.0  
Operating Segments | Weetabix      
Goodwill [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 5.20% 6.40%  
Operating Segments | Other Segments      
Goodwill [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 18.00% 13.00%  
Operating Segments | Cheese and dairy      
Goodwill [Line Items]      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 5.30%