Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Cash Flows from Operating Activities:
Net earnings from continuing operations, including noncontrolling interests	$ 366.9	$ 312.9	$ 742.5
Adjustments to reconcile net earnings including noncontrolling interest to net cash provided by operating activities:
Depreciation and amortization	476.9	407.1	380.2
Loss (gain) on extinguishment of debt, net	2.1	(40.5)	(72.6)
Impairment of goodwill	0.0	42.2	0.0
Unrealized loss (gain) on interest rate swaps, foreign exchange contracts and warrant liabilities, net	29.2	(44.3)	(296.2)
Gain on investment in BellRing	0.0	(5.1)	(437.1)
Non-cash stock-based compensation expense	84.4	77.2	65.8
Equity method loss, net of tax	0.1	0.3	67.1
Deferred income taxes	(35.5)	(22.9)	(9.7)
Non-cash gain on write-off of deferred underwriting commissions	0.0	(10.7)	0.0
Other, net	(5.8)	24.6	0.9
Other changes in operating assets and liabilities, net of business acquisitions, divestitures and held for sale assets and liabilities:
(Increase) decrease in receivables, net	(19.5)	30.6	(102.0)
Decrease (increase) in inventories	63.3	(31.9)	(86.8)
(Increase) decrease in prepaid expenses and other current assets	(49.7)	50.2	0.3
(Increase) decrease in other assets	(1.6)	(17.0)	28.8
Increase (decrease) in accounts payable and other current liabilities	2.4	(29.9)	106.4
Increase (decrease) in non-current liabilities	18.5	7.5	(3.4)
Net Cash Provided by Operating Activities - continuing operations	931.7	750.3	384.2
Net Cash Used in Operating Activities - discontinued operations	0.0	0.0	(1.6)
Net Cash Provided by Operating Activities	931.7	750.3	382.6
Cash Flows from Investing Activities
Business acquisitions, net of cash acquired	(248.1)	(715.2)	(24.8)
Return of subsidiary investments held in trust account	0.0	345.0	0.0
Additions to property	(429.5)	(303.0)	(255.3)
Proceeds from sale of property and assets held for sale	0.6	1.3	18.0
Proceeds from sale of business	0.6	4.6	50.5
Other, net	(1.1)	(2.0)	(8.6)
Net Cash Used in Investing Activities - continuing operations	(677.5)	(669.3)	(220.2)
Net Cash Used in Investing Activities - discontinued operations	0.0	0.0	(0.8)
Net Cash Used in Investing Activities	(677.5)	(669.3)	(221.0)
Cash Flows from Financing Activities
Proceeds from issuance of debt	2,845.0	530.0	2,365.0
Repayments of debt, net of discounts	(2,041.6)	(306.9)	(1,563.3)
Purchases of treasury stock	(300.7)	(387.1)	(443.0)
Premium from issuance of debt	0.0	0.0	17.5
Payments of debt issuance costs, deferred financing fees and tender fees	(35.0)	(3.1)	(26.4)
Payments of debt premiums	(8.6)	0.0	(24.1)
Redemption of Post Holdings Partnering Corporation Series A common stock	0.0	(312.5)	0.0
Financing portion of cash paid for rate-lock interest rate swaps	0.0	(43.5)	0.0
Payments for share repurchase contracts	(50.0)	0.0	0.0
Proceeds from share repurchase contracts	50.9	0.0	0.0
Distributions to BellRing Brands, Inc., net	0.0	0.0	(547.2)
Other, net	(44.4)	(32.6)	(15.7)
Net Cash Provided by (Used in) Financing Activities - continuing operations	415.6	(555.7)	(237.2)
Net Cash Used in Financing Activities - discontinued operations	0.0	0.0	(149.5)
Net Cash Provided by (Used in) Financing Activities	415.6	(555.7)	(386.7)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	3.9	1.8	(9.0)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	673.7	(472.9)	(234.1)
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	117.2	590.1	671.6
Cash, Cash Equivalents and Restricted Cash from discontinued operations, Beginning of Year	0.0	0.0	152.6
Cash, Cash Equivalents and Restricted Cash from discontinued operations, End of Year		0.0	0.0
Cash, Cash Equivalents and Restricted Cash, End of Year	$ 790.9	$ 117.2	$ 590.1