v3.24.1.u1
PHPC (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2023
May 30, 2023
Sep. 30, 2021
Dec. 31, 2022
Sep. 30, 2022
Schedule of Equity Method Investments            
Investments held in trust     $ 353.4      
Redeemable noncontrolling interest     312.5      
Maximum interest to pay dissolution expenses           $ 0.1
Gain on write-off of underwriting commissions     $ 10.7      
Initial public offering costs       $ 17.9    
Deferred Offering Costs           $ 10.7
Series A common stock included in each unit           1
PHPC Units            
Schedule of Equity Method Investments            
Common Unit, Issued       34,500,000    
Share Price           $ 10.00
Redemption Price     $ 10.24      
PHPC Warrants            
Schedule of Equity Method Investments            
Class of Warrant or Right, Exercise Price of Warrants or Rights           11.50
PHPC Private Placement Units            
Schedule of Equity Method Investments            
Share Price           $ 10.00
PHPC Sponsor | PHPC Private Placement Units            
Schedule of Equity Method Investments            
Common Unit, Issued       1,100,000    
PHPC | PHPC Units            
Schedule of Equity Method Investments            
Proceeds from initial public offering       $ 345.0    
PHPC | PHPC Private Placement Units            
Schedule of Equity Method Investments            
Proceeds from Issuance of Private Placement       $ 10.9    
PHPC | Post Holdings, Inc.            
Schedule of Equity Method Investments            
Noncontrolling Interest, Ownership Percentage by Parent     31.00%      
PHPC | Public Shareholders            
Schedule of Equity Method Investments            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     69.00%      
PHPC Sponsor | Series F Common Stock            
Schedule of Equity Method Investments            
Common Stock, Shares, Outstanding           8,600,000
PHPC Sponsor | PHPC Units            
Schedule of Equity Method Investments            
Common Unit, Issued     4,000,000.0 4,000,000.0    
Return of subsidiary investments held in trust account     $ 40.9      
Redeemable Noncontrolling Interest            
Schedule of Equity Method Investments            
Redeemable noncontrolling interest $ 310.6 $ 310.6     $ 308.1 $ 306.6
Net earnings attributable to redeemable noncontrolling interest 1.2 2.8        
Noncontrolling interest, Redemption value adjustment (2.5) (4.0)        
Noncontrolling Interest, Change in Redemption Value $ (1.3) $ (1.2)