Business Combinations (Details) £ in Millions, shares in Millions, $ in Millions				3 Months Ended
	Dec. 01, 2023 USD ($)	Dec. 01, 2023 GBP (£)	Apr. 28, 2023 USD ($) shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)
Business Acquisition
Net Sales				$ 1,965.9	$ 1,566.3
Goodwill				4,652.4		$ 4,574.4
Selling, general and administrative expenses				322.9	$ 228.7
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				5.0
Receivables, net				56.3		$ 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
Net Sales				19.5
Segment Profit (Loss)				0.1
Transaction-related expenses				1.8
Cash and cash equivalents				0.3
Receivables, net				40.8
Inventories				21.1
Prepaid expenses and other current assets				0.4
Property, net				73.8
Other intangible assets, net				79.0
Other assets				2.9
Accounts payable				(21.2)
Other current liabilities				(1.6)
Other liabilities				(1.8)
Total identifiable net assets				193.7
Goodwill				41.6
Fair value of total consideration transferred				235.3
Business Combination, WC Receivable				$ 3.5
Perfection | Customer Relationships
Business Acquisition
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				16 years
Other intangible assets, net				$ 79.0
Deeside
Business Acquisition
Payments to Acquire Businesses, Base Purchase Price	$ 14.3
Net Sales				2.3
Segment Profit (Loss)				(0.2)
Fair value of total consideration transferred				20.5
Business Combination, Bargain Purchase, Gain Recognized, Amount				$ 6.2
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]				Other Operating Income (Expense), Net
Deeside | Euro Member Countries, Euro
Business Acquisition
Payments to Acquire Businesses, Base Purchase Price | £		£ 11.3