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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents, fair value	$ 885.0	$ 554.0
Fair Value, Nonrecurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment owned, fair value	85.0	37.0
Liabilities, fair value adjustment	0.0
Assets, fair value adjustment	0.0
Money Market Funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalents, fair value	$ 802.0	$ 193.0

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