Basis of Presentation and Significant Accounting Policies - Additional Information (Details)		1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 15, 2026 Segment	Feb. 06, 2025 Segment	Dec. 31, 2025 USD ($) Segment shares	Dec. 31, 2025 USD ($) Segment $ / shares shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Basis of presentation and significant accounting policies [Line Items]
Number of reportable segment | Segment		0	1	1
Number of operating segment | Segment	1		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 Reporting Segment by analyzing the Company's consolidated financial statements. Net income attributable to Millrose, as presented on the Company’s 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 consolidated balance sheets, is used to measure the Reporting Segment’s assets.
Revenues				$ 600,461,000
Cash			$ 35,000,000	35,000,000
Cash equivalents			0	0
Restricted cash			0	0
Cash and cash equivalents			35,046,000	35,046,000	$ 0
Development loan receivables, net			328,999,000	328,999,000
Development loan principal receivables			323,308,000	323,308,000
Total inventories					5,465,290,000
Inventory valuation adjustments					0
Option fee revenues				570,957,000
Development loan income				29,504,000	0	$ 0
Deferred financing costs			30,938,000	$ 30,938,000
Dividends declared | $ / shares				$ 2.55
Development guarantee holdback liability			$ 100,000,000	$ 100,000,000
Site improvement gurantee due period				10 days
Percentage of development guarantee			50.00%	50.00%
Management fee expense				$ 87,751,000
Sales, general, and administrative expenses				25,000,000	246,200,000	$ 209,800,000
Other income (expense)				85,695,000
Interest expense				91,792,000
Interest income				$ 7,702,000
2024 Incentive Plan
Basis of presentation and significant accounting policies [Line Items]
RSU awards outstanding | shares			60,555	60,555
Development Loan Receivables
Basis of presentation and significant accounting policies [Line Items]
Development loan receivables, net			$ 328,999,000	$ 328,999,000	0
Development loan principal receivables			323,308,000	323,308,000	$ 0
Credit allowances / Allowance for credit losses			1,005,000	$ 1,005,000
Provision for credit loss expense			1,005,000
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				$ 87,800,000
Lennar
Basis of presentation and significant accounting policies [Line Items]
Revenues				$ 501,500,000
Percentage of revenue				84.00%
Percentage of total option fee revenue				88.00%
Revolving Credit Facility
Basis of presentation and significant accounting policies [Line Items]
Unamortized debt issuance expense			6,900,000	$ 6,900,000
Interest expense				91,800,000
Accelerated debt issuance cost amortization				11,900,000
Other expenses				1,600,000
DDTL Credit Facility
Basis of presentation and significant accounting policies [Line Items]
Unamortized debt issuance expense			11,900,000	11,900,000
Senior Notes
Basis of presentation and significant accounting policies [Line Items]
Unamortized debt issuance expense			30,900,000	30,900,000
Amortization recorded to interest expense				2,300,000
PIK Interest | Development Loan Receivables
Basis of presentation and significant accounting policies [Line Items]
Credit allowances / Allowance for credit losses			$ 1,000,000	$ 1,000,000
Real Estate Investment Trust (REIT)
Basis of presentation and significant accounting policies [Line Items]
Percentage of taxable income				90.00%