Annual report pursuant to Section 13 and 15(d)

Cover Page

v3.22.1
Cover Page - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 21, 2022
Document Information [Line Items]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2021  
Document Transition Report false  
Entity File Number 001-40441  
Entity Registrant Name Post Holdings Partnering Corporation  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 86-1759669  
Entity Address, Address Line One 2503 S. Hanley Road  
Entity Address, City or Town St. Louis  
Entity Address, State or Province MO  
Entity Address, Postal Zip Code 63144  
City Area Code 314  
Local Phone Number 644-7600  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Ex Transition Period false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Shell Company true  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
Amendment Flag false  
Entity Central Index Key 0001843716  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
ICFR Auditor Attestation Flag false  
Entity Public Float $ 298,900,000  
Units, each consisting of one share of Series A Common Stock and one-third of one redeemable warrant    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one share of Series A Common Stock and one-third of one redeemable warrant  
Trading Symbol PSPC.U  
Security Exchange Name NYSE  
Series A common stock    
Document Information [Line Items]    
Title of 12(b) Security Series A Common Stock, par value $0.0001 per share  
Trading Symbol PSPC  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding (in shares)   35,590,000
Redeemable warrants, each whole warrant exercisable for one share of Series A Common Stock at an exercise price of $11.50 per share    
Document Information [Line Items]    
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one share of Series A Common Stock at an exercise price of $11.50 per share  
Trading Symbol PSPC WS  
Security Exchange Name NYSE  
Series F common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding (in shares)   8,625,000