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Goodwill (Tables)
 12 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill
Post Consumer BrandsWeetabixFoodserviceRefrigerated RetailTotal
Balance, September 30, 2022
Goodwill (gross)$2,066.8 $781.6 $1,355.3 $803.7 $5,007.4 
Accumulated impairment losses(609.1)— — (48.7)(657.8)
Goodwill (net)$1,457.7 $781.6 $1,355.3 $755.0 $4,349.6 
Goodwill from acquisitions
194.2 — — — 194.2 
Impairment loss— — — (42.2)(42.2)
Currency translation adjustment0.1 72.7 — — 72.8 
Balance, September 30, 2023
Goodwill (gross)$2,261.1 $854.3 $1,355.3 $803.7 $5,274.4 
Accumulated impairment losses(609.1)— — (90.9)(700.0)
Goodwill (net)$1,652.0 $854.3 $1,355.3 $712.8 $4,574.4 
Goodwill from acquisition43.2 — — — 43.2 
Currency translation adjustment— 83.1 — — 83.1 
Balance, September 30, 2024
Goodwill (gross)$2,304.3 $937.4 $1,355.3 $803.7 $5,400.7 
Accumulated impairment losses(609.1)— — (90.9)(700.0)
Goodwill (net)$1,695.2 $937.4 $1,355.3 $712.8 $4,700.7