Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Feb. 28, 2026	Jan. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of new equity investment		$ 26.0
Gain on new equity investment		$ 6.3
Equity investments with readily determinable fair values			$ 0.9		$ 12.8
Net gains (losses) recognized during the period on equity securities			54.0	$ (11.5)
Less: Net gains recognized during the period on equity securities sold/exchanged during the period			1.5	0.0
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date			52.5	$ (11.5)
Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investment without readily determinable fair value, cumulative downward adjustment			8.4
Equity investment without readily determinable fair value, cumulative upward adjustment			49.6
Equity investments without readily determinable fair value, upward price adjustment	$ 46.2
Reported Value Measurement | Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investment without readily determinable fair value			$ 123.1		$ 50.8