v3.26.1
Basis of Presentation and Significant Accounting Policies - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 07, 2025
USD ($)
Feb. 06, 2025
Segment
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Segment
shares
Jun. 30, 2025
USD ($)
Apr. 01, 2026
USD ($)
Dec. 31, 2025
USD ($)
Basis of presentation and significant accounting policies [Line Items]                
Net cash flows from operating activities         $ 1,683,313,000 $ 1,610,015,000    
Net cash provided by investing activities         $ (1,796,857,000) (2,812,628,000)    
Number of reportable segment | Segment   0     1      
Number of operating segment | Segment         1      
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]         srt:ChiefExecutiveOfficerMember      
Segment Reporting, Expense Information Used by CODM, Description         The CODM evaluates the performance of the Reporting Segment by analyzing the Company's condensed consolidated financial statements. Net income attributable to Millrose, as presented on the Company’s condensed consolidated statements of operations, is the primary metric utilized by the CODM to assess the Reporting Segment’s performance and to allocate resources. Total assets, as presented on the Company’s condensed consolidated balance sheets, is used to measure the Reporting Segment’s assets.      
Cash     $ 34,200,000   $ 34,200,000      
Cash equivalents     0   0      
Restricted cash     0   0      
Credit allowances / Allowance for credit losses     100,000   100,000   $ 900,000  
Unamortized debt issuance expense     39,300,000   39,300,000      
Development loan income     1,453,000 $ 7,918,000 11,081,000 10,535,000    
Development guarantee holdback liability     $ 100,000,000   $ 100,000,000     $ 100,000,000
Site improvement gurantee due period         10 days      
Percentage of development guarantee     50.00%   50.00%      
Development guarantee holdback liability     $ 100,000,000   $ 100,000,000     100,000,000
Revenues     196,853,000 149,002,000 391,781,000 231,700,000    
Management fee expense     29,909,000 21,960,000 58,061,000 34,064,000    
Sales, general, and administrative expenses $ 25,000,000              
Other income (expense)     39,297,000 9,333,000 77,461,000 10,781,000    
Interest expense     40,014,000 10,285,000 79,226,000 12,821,000    
Other expenses     400,000 800,000 500,000 800,000    
Interest income     1,108,000 1,818,000 2,236,000 2,906,000    
Development Loan Receivables                
Basis of presentation and significant accounting policies [Line Items]                
Credit allowances / Allowance for credit losses     98,000   98,000   $ 284,200,000 $ 1,005,000
Reduction to its allowance for credit losses         $ 900,000      
Kennedy Lewis Land and Residential Advisors LLC                
Basis of presentation and significant accounting policies [Line Items]                
Percentage of management fee paid         1.25%      
Percentage of management fee quarterly payment         0.3125%      
Management fee expense     29,900,000 22,000,000 $ 58,100,000 34,100,000    
Lennar                
Basis of presentation and significant accounting policies [Line Items]                
Revenues     $ 141,500,000   $ 281,800,000      
Percentage of revenue     72.00%   72.00%      
Percentage of total option fee revenue     72.00%   74.00%      
Revolving Credit Facility                
Basis of presentation and significant accounting policies [Line Items]                
Unamortized debt issuance expense     $ 5,300,000   $ 5,300,000      
Interest expense       10,300,000   12,800,000    
Interest income       $ 1,800,000   $ 2,900,000    
DDTL Credit Facility                
Basis of presentation and significant accounting policies [Line Items]                
Unamortized debt issuance expense     11,400,000   11,400,000      
Senior Notes                
Basis of presentation and significant accounting policies [Line Items]                
Unamortized debt issuance expense     $ 27,900,000   $ 27,900,000      
Real Estate Investment Trust (REIT)                
Basis of presentation and significant accounting policies [Line Items]                
Percentage of taxable income         90.00%      
Class A Common Stock | 2024 Incentive Plan                
Basis of presentation and significant accounting policies [Line Items]                
Outstanding RSU awards | shares     44,320   44,320      
Shares available for issuance | shares     11,531,269   11,531,269      
Revision of prior period error correction adjustment member                
Basis of presentation and significant accounting policies [Line Items]                
Net cash flows from operating activities         $ 1,480,000,000      
Net cash provided by investing activities         $ (1,480,000,000)