Fair Values - Narrative (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	$ 1,500.0		$ 1,500.0		$ 1,100.0
Net upward adjustments of equity securities without readily determinable fair values	6.0	$ 0.3	306.0	$ 91.0
Net downward adjustments of equity securities without readily determinable fair values	0.0	$ 2.0	10.0	$ 40.0
Cumulative net unrealized gains for equity investments without readily determinable fair values	1,500.0		1,500.0
Cumulative net unrealized losses for equity investments without readily determinable fair values	500.0		500.0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	$ 800.0		$ 800.0		$ 500.0