Balance Sheet Components (Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Prepaid expenses	$ 179.9	$ 140.9
Fair value of financial instruments	142.4	261.6
Equity securities	60.1	55.5
Deferred charge for taxes on intercompany profit	665.1	526.6
Income tax receivable	339.2	300.7
Other current assets	259.4	387.2
Prepaid expenses and other current assets	1,685.8	1,710.5
Available-for-sale fixed income investments
Property, Plant and Equipment [Line Items]
Available-for-sale securities	$ 39.7	$ 38.0