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Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized Gain on Securities $ 402.3    
Debt Securities, Trading, and Equity Securities, FV-NI 330.6 $ 325.7  
Debt Securities, Available-for-sale [1] 1,139.0    
Fair Value, Option, Changes in Fair Value, Gain (Loss) 12.3    
Foreign exchange (gains) losses, net (7.4)    
Fair Value, Option, Loans Held as Assets [Abstract]      
Debt Securities [2]     $ 400.0
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions (8.8)    
Derivative, Forward Interest Rate     1.50%
Investment Owned, Unrecognized Unrealized Appreciation (Depreciation), Net [Abstract]      
Value appreciation rights, Unrecognized Unrealized Appreciation (Depreciation), Net $ (3.5)    
Ordinary voting shares [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment ownership percentage 38.00%    
Preference shares [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment ownership percentage 27.00%    
Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] $ 7.1 7.1  
Equity Securities [4] 7,721.7 7,399.3  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 330.6 325.7  
Debt Securities, Available-for-sale [1] 1,139.0 1,136.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 2.3 4.1  
Assets, Fair Value Disclosure 9,388.1 8,956.3  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.3 11.7  
Business Combination, Contingent Consideration, Liability [7] 17.7 17.5  
Liabilities, Fair Value Disclosure 19.0 29.2  
Fair Value, Recurring | Research and Development Expense      
Investment Owned, Unrecognized Unrealized Appreciation (Depreciation), Net [Abstract]      
Changes in fair value of contingent consideration 0.2    
Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] 7.1 7.1  
Equity Securities [4] 7,721.7 7,399.3  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 0.0 0.0  
Debt Securities, Available-for-sale [1] 0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 0.0 0.0  
Assets, Fair Value Disclosure 7,866.2 7,434.4  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0  
Business Combination, Contingent Consideration, Liability [7] 0.0 0.0  
Liabilities, Fair Value Disclosure 0.0 0.0  
Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] 0.0 0.0  
Equity Securities [4] 0.0 0.0  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 0.0 0.0  
Debt Securities, Available-for-sale 1,139.0 1,136.0 [1]  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 2.3 4.1  
Assets, Fair Value Disclosure 1,191.3 1,196.2  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.3 11.7  
Business Combination, Contingent Consideration, Liability [7] 0.0 0.0  
Liabilities, Fair Value Disclosure 1.3 11.7  
Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] 0.0 0.0  
Equity Securities [4] 0.0 0.0  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 330.6 325.7  
Debt Securities, Available-for-sale [1] 0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 0.0 0.0  
Assets, Fair Value Disclosure 330.6 325.7  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0  
Business Combination, Contingent Consideration, Liability [7] 17.7 17.5  
Liabilities, Fair Value Disclosure 17.7 17.5  
Commercial Paper [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   12.5  
Commercial Paper [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   0.0  
Commercial Paper [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   12.5  
Commercial Paper [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   0.0  
Time Deposits [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 50.0 36.6  
Time Deposits [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 0.0 0.0  
Time Deposits [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 50.0 36.6  
Time Deposits [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 0.0 0.0  
Money Market Funds [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 137.4 28.0  
Money Market Funds [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 137.4 28.0  
Money Market Funds [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 0.0 0.0  
Money Market Funds [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 0.0 0.0  
Cash Equivalents [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 187.4 84.1  
Cash Equivalents [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 137.4 28.0  
Cash Equivalents [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 50.0 56.1  
Cash Equivalents [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 0.0 0.0  
US Treasury Securities | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   7.0  
US Treasury Securities | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   7.0  
US Treasury Securities | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   0.0  
Foreign Government Debt [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8]   0.0  
Municipal Obligations (Member) | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 9.5 12.1  
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 9.5 12.1  
Municipal Obligations (Member) | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Foreign Government Obligations [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 3.8 12.7  
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 3.8 12.7  
Foreign Government Obligations [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Corporate Debt Securities [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 551.0 531.6  
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 551.0 531.6  
Corporate Debt Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
US Government Sponsored Agencies [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 281.4 255.9  
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 281.4 255.9  
US Government Sponsored Agencies [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Asset-backed Securities [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 293.3 323.7  
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 293.3 323.7  
Asset-backed Securities [Member] | Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 0.0 0.0  
Short-term Investments [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities [4] 73.3 67.2  
Debt Securities, Available-for-sale [1] 1,139.0 1,136.0  
Short-term Investments [Member] | Municipal Obligations (Member) | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 9.5 12.1  
Short-term Investments [Member] | Foreign Government Obligations [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 3.8 12.7  
Short-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 551.0 531.6  
Short-term Investments [Member] | US Government Sponsored Agencies [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 281.4 255.9  
Short-term Investments [Member] | Asset-backed Securities [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 293.3 323.7  
Other Investments [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] 1.5 1.5  
Equity Securities [4] 7,648.4 7,332.1  
Restricted investment [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] $ 5.6 $ 5.6  
[1] Available-for-sale investments are included in Short-term investments in the condensed consolidated balance sheets.
[2] The Loan under the fair value option is included in Other investments in the condensed consolidated balance sheets.
[3] Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
March 31, 2024December 31, 2023
Restricted investments$5.6 $5.6 
Other investments1.5 1.5 
    Total$7.1 $7.1 
[4] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
March 31, 2024December 31, 2023
Short-term investments$73.3 $67.2 
Other investments7,648.4 7,332.1 
        Total$7,721.7 $7,399.3 
[5] Forward foreign exchange contracts in an asset position are included in Other current assets in the condensed consolidated balance sheets.
[6] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the condensed consolidated balance sheets.
[7] Contingent considerations in a liability position are included in Other long-term liabilities in the condensed consolidated balance sheets. The changes in the fair value of contingent consideration included in Research and development expense amounted to $0.2 million in the consolidated statements of income for the three months ended March 31, 2024. No conditions triggering payment of the contingent consideration were met as of March 31, 2024.
[8] Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.