Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net Earnings Including Redeemable Noncontrolling Interest	$ 31.8	$ 25.1
Adjustments to reconcile net earnings including redeemable noncontrolling interest to net cash flow used in operating activities:
Depreciation and amortization	6.4	6.4
Non-cash stock-based compensation expense	0.3	0.0
Deferred income taxes	0.2	1.7
Other, net	1.1	2.6
Other changes in operating assets and liabilities:
(Increase) decrease in receivables	(25.3)	9.8
Increase in inventories	(11.8)	(18.3)
Increase in prepaid expenses and other current assets	(5.8)	(0.1)
Decrease in other assets	0.8	0.1
Decrease in accounts payable and other current liabilities	(22.5)	(21.7)
(Decrease) increase in non-current liabilities	(0.1)	0.3
Net Cash (Used in) Provided by Operating Activities	(24.9)	5.9
Cash Flows from Investing Activities:
Additions to property	(0.7)	(1.0)
Net Cash Used in Investing Activities	(0.7)	(1.0)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	806.0	0.0
Proceeds from issuance of common stock, net of issuance costs	524.4	0.0
Repayments of long-term debt	(1,265.0)	0.0
Payments of debt issuance costs and deferred financing fees	(9.6)	0.0
Distributions (to) from Post Holdings, Inc., net	(5.9)	(6.4)
Net Cash Provided by (Used in) Financing Activities	49.9	(6.4)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	0.1	(0.2)
Cash and Cash Equivalents, Period Increase (Decrease)	24.4	(1.7)
Cash and Cash Equivalents, Beginning of Period	5.5	10.9
Cash and Cash Equivalents, End of Period	$ 29.9	$ 9.2