Fair Values - Equity Securities Without Readily Determinable Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	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	$ 1,100.0	$ 900.0
Net upward adjustments of equity securities without readily determinable fair values	158.0	85.0	$ 18.0
Net downward adjustments of equity securities without readily determinable fair values	43.0	37.0	$ 142.0
Cumulative net unrealized gains for equity investments without readily determinable fair values	1,200.0
Cumulative net unrealized losses for equity investments without readily determinable fair values	500.0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, 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	$ 500.0	$ 1.0