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RELATED PARTIES (Details) - USD ($) $ in Millions		9 Months Ended
	May 16, 2025	Sep. 30, 2025	Dec. 31, 2024
Related Party Transactions [Line Items]
Stock consideration		$ 3,010.5	$ 4,010.5
Series A Preferred Stock
Related Party Transactions [Line Items]
Value of shares repurchased	$ 1,000.0	$ 1,159.3
MassMutual | Invesco | MassMutual
Related Party Transactions [Line Items]
Approximate stake help in common stock of combined firm (percent)		18.30%

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