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Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Trading, and Equity Securities, FV-NI $ 305.6 $ 305.6 $ 325.7  
Debt Securities, Available-for-sale [1] 1,135.6 1,135.6    
Fair Value, Option, Changes in Fair Value, Gain (Loss) (22.7) (10.4)    
Foreign exchange (gains) losses, net   (9.7)    
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 (6.2) (15.0)    
Derivative, Forward Interest Rate       1.50%
Investment Owned, Unrecognized Unrealized Appreciation (Depreciation), Net [Abstract]        
Value appreciation rights, Unrecognized Unrealized Appreciation (Depreciation), Net $ 28.9 $ 25.4    
Ordinary voting shares [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment ownership percentage 38.00% 38.00%    
Preference shares [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment ownership percentage 27.00% 27.00%    
Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted Investments, at Fair Value [3] $ 7.2 $ 7.2 7.1  
Equity Securities [4] 4,825.6 4,825.6 7,399.3  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 305.6 305.6 325.7  
Debt Securities, Available-for-sale [1] 1,135.6 1,135.6 1,136.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 1.5 1.5 4.1  
Assets, Fair Value Disclosure 6,392.1 6,392.1 8,956.3  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.2 1.2 11.7  
Business Combination, Contingent Consideration, Liability [7] 17.9 17.9 17.5  
Liabilities, Fair Value Disclosure 19.1 19.1 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 0.4    
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] 7.2 7.2 7.1  
Equity Securities [4] 4,825.6 4,825.6 7,399.3  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 0.0 0.0 0.0  
Debt Securities, Available-for-sale [1] 0.0 0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 0.0 0.0 0.0  
Assets, Fair Value Disclosure 4,909.1 4,909.1 7,434.4  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0 0.0  
Business Combination, Contingent Consideration, Liability [7] 0.0 0.0 0.0  
Liabilities, Fair Value Disclosure 0.0 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 0.0  
Equity Securities [4] 0.0 0.0 0.0  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 0.0 0.0 0.0  
Debt Securities, Available-for-sale 1,135.6 1,135.6 1,136.0 [1]  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 1.5 1.5 4.1  
Assets, Fair Value Disclosure 1,177.4 1,177.4 1,196.2  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.2 1.2 11.7  
Business Combination, Contingent Consideration, Liability [7] 0.0 0.0 0.0  
Liabilities, Fair Value Disclosure 1.2 1.2 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 0.0  
Equity Securities [4] 0.0 0.0 0.0  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 305.6 305.6 325.7  
Debt Securities, Available-for-sale [1] 0.0 0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 0.0 0.0 0.0  
Assets, Fair Value Disclosure 305.6 305.6 325.7  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0 0.0  
Business Combination, Contingent Consideration, Liability [7] 17.9 17.9 17.5  
Liabilities, Fair Value Disclosure 17.9 17.9 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] 40.3 40.3 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 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] 40.3 40.3 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 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] 76.3 76.3 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] 76.3 76.3 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 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 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] 116.6 116.6 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] 76.3 76.3 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] 40.3 40.3 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 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] 8.3 8.3 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 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] 8.3 8.3 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 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] 2.6 2.6 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 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] 2.6 2.6 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 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] 545.0 545.0 531.6  
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 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] 545.0 545.0 531.6  
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 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] 246.1 246.1 255.9  
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 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] 246.1 246.1 255.9  
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 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] 333.6 333.6 323.7  
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 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] 333.6 333.6 323.7  
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 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] 73.6 73.6 67.2  
Debt Securities, Available-for-sale [1] 1,135.6 1,135.6 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] 8.3 8.3 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] 2.6 2.6 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] 545.0 545.0 531.6  
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] 246.1 246.1 255.9  
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] 333.6 333.6 323.7  
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] 1.6 1.6 1.5  
Equity Securities [4] 4,752.0 4,752.0 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 $ 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):
June 30, 2024December 31, 2023
Restricted investments$5.6 $5.6 
Other investments1.6 1.5 
    Total$7.2 $7.1 
[4] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
June 30, 2024December 31, 2023
Short-term investments$73.6 $67.2 
Other investments4,752.0 7,332.1 
        Total$4,825.6 $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 and $0.4 million in the condensed consolidated statements of income (loss) for the three and six months ended June 30, 2024, respectively. No conditions triggering payment of the contingent consideration were met as of June 30, 2024.
[8] Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.