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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

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