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Investments - Current and Non-current of Available-for-Sale Debt Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Reported under the following captions in our consolidated balance sheets:    
Total $ 2,969.3 $ 3,757.2
Cash and cash equivalents    
Reported under the following captions in our consolidated balance sheets:    
Current available-for-sale debt securities 41.6 75.9
Current marketable investments    
Reported under the following captions in our consolidated balance sheets:    
Current available-for-sale debt securities 1,435.8 1,771.5
Non-current marketable investments    
Reported under the following captions in our consolidated balance sheets:    
Non-current marketable investments $ 1,491.9 $ 1,909.8