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Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities, FV-NI, Unrealized Gain (Loss)   $ 727.7    
Debt Securities, Trading, and Equity Securities, FV-NI   359.1 $ 373.4  
Debt Securities, Available-for-sale   974.4    
Fair Value, Option, Changes in Fair Value, Gain (Loss)   (8.4)    
Foreign exchange (gains) losses, net   (5.9)    
Fair Value, Option, Loans Held as Assets [Abstract]        
Debt Securities       $ 400.0
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions   3.8    
Derivative, Forward Interest Rate       1.50%
Value Appreciation Right, Changes in Fair Value, Gain (Loss)   $ 4.6    
Stilla Technologies        
Fair Value, Option, Loans Held as Assets [Abstract]        
Business Combination, Consideration Transferred, Contingent Consideration $ 28.5      
Maximum | Stilla Technologies        
Fair Value, Option, Loans Held as Assets [Abstract]        
Business Combination, Consideration Transferred, Contingent Consideration $ 50.0      
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]        
Business Combination, Contingent Consideration, Liability   $ 29.7 29.6  
Restricted Investments, at Fair Value   1.1 1.1  
Equity Securities   4,984.1 5,740.5  
Debt Securities, Trading, and Equity Securities, FV-NI   359.1 373.4  
Debt Securities, Available-for-sale   974.4 939.6  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure   3.7 1.2  
Assets, Fair Value Disclosure   6,472.5 7,366.4  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure   2.0 1.8  
Liabilities, Fair Value Disclosure   31.7 31.4  
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   1.1 1.1  
Equity Securities   4,984.1 5,740.5  
Debt Securities, Trading, and Equity Securities, FV-NI   0.0 0.0  
Debt Securities, Available-for-sale   0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure   0.0 0.0  
Assets, Fair Value Disclosure   5,099.8 5,951.3  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure   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]        
Business Combination, Contingent Consideration, Liability   0.0 0.0  
Restricted Investments, at Fair Value   0.0 0.0  
Equity Securities   0.0 0.0  
Debt Securities, Trading, and Equity Securities, FV-NI   0.0 0.0  
Debt Securities, Available-for-sale   974.4 939.6  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure   3.7 1.2  
Assets, Fair Value Disclosure   1,013.6 1,041.7  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure   2.0 1.8  
Liabilities, Fair Value Disclosure   2.0 1.8  
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   29.7 29.6  
Restricted Investments, at Fair Value   0.0 0.0  
Equity Securities   0.0 0.0  
Debt Securities, Trading, and Equity Securities, FV-NI   359.1 373.4  
Debt Securities, Available-for-sale   0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure   0.0 0.0  
Assets, Fair Value Disclosure   359.1 373.4  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure   0.0 0.0  
Liabilities, Fair Value Disclosure   29.7 29.6  
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   114.6 209.7  
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   114.6 209.7  
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   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   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   150.1 310.6  
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   114.6 209.7  
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   35.5 100.9  
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   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     59.9  
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     59.9  
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     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     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   35.5 39.4  
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   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   35.5 39.4  
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   0.0 0.0  
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     1.6  
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     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     1.6  
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     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   13.5 14.9  
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   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   13.5 14.9  
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   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   11.7 11.7  
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   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   11.7 11.7  
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   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   481.5 451.9  
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   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   481.5 451.9  
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   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   77.6 79.6  
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   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   77.6 79.6  
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   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   390.1 381.5  
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   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   390.1 381.5  
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   0.0 0.0  
Location, Statement of Financial Position, Balance [Axis]: us-gaap:LongTermInvestments | Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities   4,900.8 5,669.2  
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments | Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities   83.3 71.3  
Debt Securities, Available-for-sale   974.4 939.6  
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments | Municipal Obligations (Member) | Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale   13.5 14.9  
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments | 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   11.7 11.7  
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments | 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   481.5 451.9  
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments | 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   77.6 79.6  
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ShortTermInvestments | 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   $ 390.1 $ 381.5