v3.20.4

Noncontrolling Interests, Equity Interests and Related Party Transactions (Tables)

3 Months Ended

Dec. 31, 2020

Equity Method Investments and Joint Ventures [Abstract]

Effects of changes in ownership of BellRing on Post equity

															Three Months Ended December 31,
															2020						2019
Increase in additional paid-in capital related to net proceeds from IPO															$	—					$	524.4
Increase in additional paid-in capital related to establishment of noncontrolling interest															—						66.3
Decrease in additional paid-in capital related to tax effects of IPO															—						(133.7)
Net transfers from noncontrolling interest															$	—					$	457.0

Equity method loss attributable to 8th Avenue

									Three Months Ended December 31,
															2020						2019
8th Avenue’s net loss available to 8th Avenue’s common shareholders															$	(10.2)					$	(8.7)
															60.5		%				60.5		%
Equity method loss available to Post															$	(6.2)					$	(5.3)
Less: Amortization of basis difference, net of tax (a)															1.7						1.7
Equity method loss, net of tax															$	(7.9)					$	(7.0)

(a)The Company adjusted the historical basis of 8th Avenue’s assets and liabilities to fair value and recognized a basis difference of $70.3. The basis difference related to property, plant and equipment and other intangible assets is being amortized over the weighted average useful lives of the assets. At December 31, 2020 and September 30, 2020, the remaining basis difference to be amortized was $52.9 and $54.6, respectively.

8th Avenue Summarized Financial Information

									Three Months Ended December 31,
															2020						2019
Net sales															$	229.0					$	218.4
Gross profit															$	35.4					$	38.4
Net loss															$	(1.4)					$	(0.9)
Less: Preferred stock dividend															8.8						7.8
Net Loss Available to 8th Avenue Common Shareholders															$	(10.2)					$	(8.7)

X

- Definition

Schedule of Equity Method Earnings (Loss)

+ References

No definition available.

+ Details

Name:	post_ScheduleofEquityMethodEarningsLossTableTextBlock
Namespace Prefix:	post_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The tabular disclosure of the effects of any changes in a parent's ownership interest in a subsidiary on the equity attributable to the parent if the ownership interests in a subsidiary changes during the period. The changes represented by this element did not result in the deconsolidation of the subsidiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4M
-URI http://asc.fasb.org/extlink&oid=120409616&loc=SL4591554-111686

+ Details

Name:	us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration