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Balance Sheet Details - Net Gain (Loss) Recognized on Equity Securities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net gain recognized on equity securities      
Net gains and losses recognized during the period on equity securities $ 0.0 $ (4.2) $ 80.1
Less: Net gains and losses recognized during the period on equity securities sold during the period 0.0 4.2 (44.1)
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date $ 0.0 $ 0.0 $ 36.0