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Income Taxes - Schedule of Reconciliation of Statutory Rate and Effective Tax Rates (Details) - PREDECESSOR MILLROSE BUSINESS [Member]	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statutory rate	21.00%	21.00%
State income rates, net of federal income tax benefit	4.30%	4.30%
Valuation allowance	(25.30%)	(25.30%)
Effective tax rate	0.00%	0.00%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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