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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized gain (losses) on T. Rowe Price investments product recognized in nonoperating income	$ 80.8	$ 44.3	$ 165.9	$ 129.3
Investments in affiliated collateralized loan obligations
Debt and Equity Securities, FV-NI [Line Items]
Secured debt, repurchase agreements	$ 34.4		$ 34.4		€ 29.3	$ 59.1	€ 56.9
Investments in affiliated collateralized loan obligations \| Minimum
Debt and Equity Securities, FV-NI [Line Items]
Repurchase agreement, interest rate	2.02%		2.02%		2.02%
Investments in affiliated collateralized loan obligations \| Maximum
Debt and Equity Securities, FV-NI [Line Items]
Repurchase agreement, interest rate	10.89%		10.89%		10.89%