Balance Sheet Components (Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Prepaid expenses	$ 268.1	$ 256.7
Fair value of financial instruments	202.8	144.6
Equity securities	48.0	51.0
Other current assets	1,208.1	1,467.1
Prepaid expenses and other current assets	1,763.6	1,957.6
Available-for-sale fixed income investments
Property, Plant and Equipment [Line Items]
Available-for-sale securities	$ 36.6	$ 38.2

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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