v3.26.1
Goodwill (Notes)
 9 Months Ended
Jun. 30, 2026
Goodwill [Abstract]  
Goodwill GOODWILL
The changes in the carrying amount of goodwill by segment are noted in the following table.
Post Consumer BrandsFoodserviceRefrigerated Retail
Weetabix
Total
Balance, September 30, 2025
Goodwill (gross)$2,408.7 $1,389.2 $835.3 $941.3 $5,574.5 
Accumulated impairment losses(609.1)— (120.7)— (729.8)
Goodwill (net)$1,799.6 $1,389.2 $714.6 $941.3 $4,844.7 
Goodwill from acquisition0.9 — — — 0.9 
Goodwill (gross) reclassified to held for sale— — (120.7)— (120.7)
Accumulated impairment losses reclassified to held for sale— — 120.7 — 120.7 
Currency translation adjustment(0.1)— — (13.8)(13.9)
Balance, June 30, 2026
Goodwill (gross)$2,409.5 $1,389.2 $714.6 $927.5 $5,440.8 
Accumulated impairment losses(609.1)— — — (609.1)
Goodwill (net)$1,800.4 $1,389.2 $714.6 $927.5 $4,831.7