Fair Values (Details Textual) - Fair Value, Nonrecurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of equity securities without readily determinable fair values	$ 900.0		$ 900.0		$ 900.0
Net upward adjustments of equity securities without readily determinable fair values	1.0	$ 0.0	68.0	$ 0.0
Net downward adjustments of equity securities without readily determinable fair values	20.0	$ 17.0	31.0	$ 122.0
Cumulative net unrealized gains for equity investments without readily determinable fair values	1,100.0		1,100.0		1,100.0
Cumulative net unrealized losses for equity investments without readily determinable fair values	456.0		456.0		431.0
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	$ 13.0		$ 13.0		$ 0.0