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Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in stock.

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Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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Amount of interest income (expense) classified as operating.

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Business, Basis of Presentation and Accounting Policies - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	Jun. 30, 2025	Apr. 03, 2025 $ / shares	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($) $ / shares	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($)
Basis of Presentation [Line Items]
Number of reportable segments \| segment			1		1
Interest expense			$ 374.0	$ 155.0	$ 723.0	$ 264.0
Interest income			$ 583.0	$ 237.0	$ 1,090.0	438.0
Rocket Limited Partnership
Basis of Presentation [Line Items]
Voting and economic interest (in percent)	100.00%				100.00%
Class A common shares
Basis of Presentation [Line Items]
Common stock dividend paid (in dollars per share) \| $ / shares		$ 0.80
Common stock dividend declared (in dollars per share) \| $ / shares				$ 0.80
Special dividend paid				$ 120.1
Revision of Prior Period, Reclassification, Adjustment One
Basis of Presentation [Line Items]
Interest expense				91.0		155.0
Revision of Prior Period, Reclassification, Adjustment
Basis of Presentation [Line Items]
Interest income				112.0		222.0
Revision of Prior Period, Reclassification, Adjustment Two
Basis of Presentation [Line Items]
Interest expense				$ 5.0		$ 13.0