Balance Sheet Components (Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Prepaid expenses	$ 239.7	$ 194.6
Fair value of financial instruments	92.5	134.7
Equity securities	45.0	42.6
Other current assets	1,350.4	1,404.0
Prepaid expenses and other current assets	1,763.6	1,811.2
Available-for-sale fixed income investments
Property, Plant and Equipment [Line Items]
Available-for-sale securities	$ 36.0	$ 35.3