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Marketable Securities and Equity Investments - Available-for-Sale Debt Securities at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Debt securities $ 4,105.5 $ 3,977.1
Cash and cash equivalents    
Debt Securities, Available-for-sale [Line Items]    
Debt securities 3,629.1 3,478.1
Marketable securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities $ 476.4 $ 499.0