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Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized Gain on Securities $ 29.0    
Debt Securities, Trading, and Equity Securities, FV-NI 336.5 $ 317.5  
Debt Securities, Available-for-sale [1] 1,063.4    
Fair Value, Option, Changes in Fair Value, Gain (Loss) 4.6    
Foreign exchange (gains) losses, net 14.4    
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 (6.0)    
Derivative, Forward Interest Rate     1.50%
Value Appreciation Right, Changes in Fair Value, Gain (Loss) $ 1.4    
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 28.00%    
Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] $ 1.3 1.6  
Equity Securities [4] 4,677.0 4,548.0  
Debt Securities, Trading, and Equity Securities, FV-NI [2] 336.5 317.5  
Debt Securities, Available-for-sale [1] 1,063.4 1,097.6  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 2.1 8.8  
Assets, Fair Value Disclosure 6,297.6 6,159.0  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.7 2.4  
Liabilities, Fair Value Disclosure 0.7 2.4  
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] 1.3 1.6  
Equity Securities [4] 4,677.0 4,548.0  
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 4,850.7 4,689.0  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 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 1,063.4 1,097.6 [1]  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 2.1 8.8  
Assets, Fair Value Disclosure 1,110.4 1,152.5  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.7 2.4  
Liabilities, Fair Value Disclosure 0.7 2.4  
Fair Value, Recurring | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
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] 336.5 317.5  
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 336.5 317.5  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0  
Liabilities, Fair Value Disclosure 0.0 0.0  
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]      
Cash and Cash Equivalents, Fair Value Disclosure [7] 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] 172.4 139.4  
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] 172.4 139.4  
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  
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  
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] 217.3 185.5  
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] 172.4 139.4  
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] 44.9 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  
US Treasury Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [7] 3.0    
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] 3.0 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 0.0  
Foreign Government Debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [7] 41.9    
Foreign Government Debt [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]   31.2  
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 0.0  
Foreign Government Debt [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] 41.9 31.2  
Foreign Government Debt [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  
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] 9.0 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  
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] 9.0 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  
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] 7.2 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  
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] 7.2 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  
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] 491.5 533.6  
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  
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] 491.5 533.6  
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  
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] 151.3 118.6  
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  
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] 151.3 118.6  
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  
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] 404.4 430.8  
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  
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] 404.4 430.8  
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  
Short-term Investments [Member] | Fair Value, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities [4] 75.6 78.8  
Debt Securities, Available-for-sale [1] 1,063.4 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] 9.0 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] 7.2 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] 491.5 533.6  
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] 151.3 118.6  
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] 404.4 430.8  
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] 1.3 1.6  
Equity Securities [4] $ 4,601.4 $ 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 the following account in the condensed consolidated balance sheets (in millions):
March 31, 2025December 31, 2024
Other investments1.3 1.6 
    Total$1.3 $1.6 
[4] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
March 31, 2025December 31, 2024
Short-term investments$75.6 $78.8 
Other investments4,601.4 4,469.2 
        Total$4,677.0 $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.