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Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Net Sales $ 7,922.7 $ 6,991.0 $ 5,851.2
Operating Profit 793.5 598.9 415.6
Impairment of goodwill 0.0 42.2 0.0
Interest expense, net 316.5 279.1 317.8
Loss (gain) on extinguishment of debt, net 2.1 (40.5) (72.6)
Expense (income) on swaps, net 15.7 (39.9) (268.0)
Gain on investment in BellRing 0.0 (5.1) (437.1)
Earnings before income taxes and equity method loss 472.1 412.9 895.3
Additions to property and intangibles 429.5 311.1 274.8
Depreciation and amortization 476.9 407.1 380.2
Assets $ 12,854.2 11,646.7  
Noncash      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions   $ 8.1 $ 19.5
Customer Concentration Risk | Revenue Benchmark | Largest customer      
Segment Reporting Information [Line Items]      
Entity-Wide Revenue, Major Customer, Percentage 19.90% 17.30% 14.40%
Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales $ 7,922.7 $ 6,991.0 $ 5,851.2
Operating Profit 1,008.1 871.4 632.2
Depreciation and amortization 452.9 398.0 376.5
Operating Segments | Post Consumer Brands Segment      
Segment Reporting Information [Line Items]      
Net Sales 4,109.6 3,033.1 2,242.7
Operating Profit 541.2 378.8 314.6
Additions to property and intangibles 202.6 112.8 91.2
Depreciation and amortization 207.3 157.3 133.1
Assets 5,106.5 4,782.2  
Operating Segments | Weetabix Segment      
Segment Reporting Information [Line Items]      
Net Sales 543.2 512.1 477.3
Operating Profit 82.9 73.9 109.5
Additions to property and intangibles 34.1 30.1 26.7
Depreciation and amortization 42.2 35.9 37.5
Assets 1,948.4 1,737.8  
Operating Segments | Foodservice and Refrigerated Retail      
Segment Reporting Information [Line Items]      
Additions to property and intangibles 190.7 144.0 136.1
Assets 4,875.2 4,921.6  
Operating Segments | Foodservice Segment      
Segment Reporting Information [Line Items]      
Net Sales 2,307.1 2,425.9 2,095.0
Operating Profit 308.1 349.5 151.0
Depreciation and amortization 131.1 128.7 127.5
Operating Segments | Refrigerated Retail Segment      
Segment Reporting Information [Line Items]      
Net Sales 962.2 1,019.7 1,036.6
Operating Profit 75.9 69.2 57.1
Depreciation and amortization 72.3 76.1 78.4
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Segment Reporting Information [Line Items]      
General corporate expenses and other 201.7 222.7 196.8
Additions to property and intangibles 2.1 24.2 20.8
Depreciation and amortization 24.0 9.1 3.7
Assets 924.1 205.1  
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Net Sales 0.6 0.2 (0.4)
Cereal | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 2,754.6 2,730.8 2,595.0
Eggs and egg products | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 2,121.6 2,304.0 2,026.1
Side dishes (including potato products) | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 754.9 732.0 652.4
Pet Food | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 1,758.3 679.8 0.0
Cheese and dairy | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 168.8 191.5 214.3
Sausage | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 165.2 163.6 171.2
Peanut butter | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 104.0 100.5 111.7
Protein-based products | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 44.2 34.1 12.9
Other | Operating Segments      
Segment Reporting Information [Line Items]      
Net Sales 51.1 55.4 68.5
Product Eliminations      
Segment Reporting Information [Line Items]      
Net Sales $ 0.0 $ (0.7) $ (0.9)
Non-US      
Segment Reporting Information [Line Items]      
Sales to Foreign Countries as a Percentage of Total Net Sales 10.20% 11.00% 12.50%
Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries $ 314.7 $ 280.9  
Revenues from External Customers and Long-Lived Assets [Line Items]      
Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries $ 314.7 $ 280.9  
U.K. as a percentage of Non-US      
Segment Reporting Information [Line Items]      
Sales to Foreign Countries as a Percentage of Total Net Sales 55.60% 54.00% 52.90%