Fair Values (Details Textual) - Fair Value, Nonrecurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	$ 1,000.0		$ 1,000.0		$ 900.0
Net upward adjustments of equity securities without readily determinable fair values	0.3	$ 1.0	91.0	$ 68.0
Net downward adjustments of equity securities without readily determinable fair values	2.0	$ 20.0	40.0	$ 31.0
Cumulative net unrealized gains for equity investments without readily determinable fair values	1,100.0		1,100.0
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	$ 400.0		$ 400.0		$ 1.0