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Balance Sheet Components (Prepaids and other current assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Prepaid Expense and Other Assets, Current [Abstract] |  |  |
Prepaid expenses | $ 256.7 | $ 267.8 |
Restricted cash | 5.0 | 5.6 | $ 15.5
Available-for-sale fixed income securities | 38.2 | 39.1 |
Fair value of financial instruments | 144.6 | 118.6 |
Equity securities | 51.0 | 45.8 |
Other current assets | 1,467.1 | 1,236.1 |
Prepaid expenses and other current assets | $ 1,957.6 | $ 1,707.4 |

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