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Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Unrealized Gain on Securities $ 326.6 $ 355.7    
Debt Securities, Trading, and Equity Securities, FV-NI 364.4 364.4 $ 317.5  
Debt Securities, Available-for-sale [1] 920.3 920.3    
Fair Value, Option, Changes in Fair Value, Gain (Loss) (2.4) 2.2    
Foreign exchange (gains) losses, net   44.7    
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 3.2 (2.8)    
Derivative, Forward Interest Rate       1.50%
Value Appreciation Right, Changes in Fair Value, Gain (Loss) $ (0.8) $ 0.6    
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 28.00% 28.00%    
Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability $ 28.5 $ 28.5    
Restricted Investments, at Fair Value [3] 1.3 1.3 1.6  
Equity Securities [4] 5,240.2 5,240.2 4,548.0  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 364.4 364.4 317.5  
Debt Securities, Available-for-sale [1] 920.3 920.3 1,097.6  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 1.5 1.5 8.8  
Assets, Fair Value Disclosure 6,641.7 6,641.7 6,159.0  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 13.7 13.7 2.4  
Liabilities, Fair Value Disclosure 42.2 42.2 2.4  
Fair Value, Recurring | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability 0.0 0.0    
Restricted Investments, at Fair Value [3] 1.3 1.3 1.6  
Equity Securities [4] 5,240.2 5,240.2 4,548.0  
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 5,317.9 5,317.9 4,689.0  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 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]        
Business Combination, Contingent Consideration, Liability 0.0 0.0    
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 920.3 920.3 1,097.6 [1]  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 1.5 1.5 8.8  
Assets, Fair Value Disclosure 959.4 959.4 1,152.5  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 13.7 13.7 2.4  
Liabilities, Fair Value Disclosure 13.7 13.7 2.4  
Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability 28.5 28.5    
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] 364.4 364.4 317.5  
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 364.4 364.4 317.5  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0 0.0  
Liabilities, Fair Value Disclosure 28.5 28.5 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 [7] 76.4 76.4 139.4  
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 [7] 76.4 76.4 139.4  
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 [7] 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 [7] 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 [7] 114.0 114.0 185.5  
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 [7] 76.4 76.4 139.4  
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 [7] 37.6 37.6 46.1  
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 [7] 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 [7]     14.9  
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 [7]     14.9  
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 [7]     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 [7]     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 [7] 37.6 37.6 31.2  
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 [7] 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 [7] 37.6 37.6 31.2  
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 [7] 0.0 0.0 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] 13.6 13.6 9.4  
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] 13.6 13.6 9.4  
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] 8.4 8.4 5.2  
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] 8.4 8.4 5.2  
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] 439.4 439.4 533.6  
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] 439.4 439.4 533.6  
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] 91.6 91.6 118.6  
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] 91.6 91.6 118.6  
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] 367.3 367.3 430.8  
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] 367.3 367.3 430.8  
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] 84.2 84.2 78.8  
Debt Securities, Available-for-sale [1] 920.3 920.3 1,097.6  
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] 13.6 13.6 9.4  
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] 8.4 8.4 5.2  
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] 439.4 439.4 533.6  
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] 91.6 91.6 118.6  
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] 367.3 367.3 430.8  
Other Investments [Member] | Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities [4] $ 5,156.0 $ 5,156.0 $ 4,469.2  
[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 Other investments in the condensed consolidated balance sheets.
[4] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
June 30, 2025December 31, 2024
Short-term investments$84.2 $78.8 
Other investments5,156.0 4,469.2 
        Total$5,240.2 $4,548.0 
[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] Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.