Business Combinations (Details) £ in Millions, shares in Millions, $ in Millions				3 Months Ended		9 Months Ended
	Dec. 01, 2023 USD ($)	Dec. 01, 2023 GBP (£)	Apr. 28, 2023 USD ($) shares	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)
Business Acquisition
Net Sales				$ 1,947.7	$ 1,859.4	$ 5,912.6	$ 5,045.6
Goodwill				4,648.7		4,648.7		$ 4,574.4
Selling, general and administrative expenses				324.5	300.9	988.7	768.9
Pet Food
Business Acquisition
Payments to Acquire Businesses, Base Purchase Price			$ 700.0
Payment at closing			715.5
Fair value of total consideration transferred			1,207.5
Issuance of common stock			$ 492.3
Pet Food | TSA Agreement
Business Acquisition
Selling, general and administrative expenses				3.5	$ 4.0	13.0	$ 4.0
Receivables, net				39.1		39.1		$ 35.5
Pet Food | Smucker | Common Stock
Business Acquisition
Stock Issued During Period, Shares, Acquisitions | shares			5.4
Perfection
Business Acquisition
Payments to Acquire Businesses, Base Purchase Price	$ 235.0
Payment at closing	238.8
Business Combination, Cash Received Related to WC Adjustment				4.6		4.6
Net Sales				62.1		146.7
Segment Profit (Loss)				4.2		9.1
Cash and cash equivalents				0.3		0.3
Receivables, net				40.8		40.8
Inventories				21.1		21.1
Prepaid expenses and other current assets				0.4		0.4
Property, net				69.9		69.9
Other intangible assets, net				81.0		81.0
Other assets				2.9		2.9
Accounts payable				(21.5)		(21.5)
Other current liabilities				(1.6)		(1.6)
Other liabilities				(1.8)		(1.8)
Total identifiable net assets				191.5		191.5
Goodwill				42.7		42.7
Fair value of total consideration transferred				234.2		$ 234.2
Perfection | Customer Relationships
Business Acquisition
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						16 years
Other intangible assets, net				81.0		$ 81.0
Deeside
Business Acquisition
Payments to Acquire Businesses, Base Purchase Price	14.3
Net Sales				7.5		17.0
Segment Profit (Loss)				(0.3)		(1.2)
Fair value of total consideration transferred	20.5
Business Combination, Bargain Purchase, Gain Recognized, Amount						$ (5.8)
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]						Other Operating Income (Expense), Net
Business Combination Bargain Purchase Adjustment to Gain Recognized Amount				$ 0.4
Business Combination, Bargain Purchase, Initial Gain Recognized, Amount	$ 6.2
Deeside | Euro Member Countries, Euro
Business Acquisition
Payments to Acquire Businesses, Base Purchase Price | £		£ 11.3