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2. Fair Value Measurements Fair Value Level Table (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Trading, and Equity Securities, FV-NI [1] $ 324.5 $ 322.6  
Debt Securities, Available-for-sale [2] 1,327.6    
Fair Value, Option, Changes in Fair Value, Gain (Loss) [1] 2.2    
Foreign exchange (gains) losses, net [1] 4.1    
Fair Value, Option, Loans Held as Assets [Abstract]      
Debt Securities [1] 400.0    
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions (8.0)    
Derivative, Forward Interest Rate     1.50%
Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] 7.0 6.8  
Equity Securities [4] 8,571.6 8,530.4  
Debt Securities, Trading, and Equity Securities, FV-NI [1] 324.5 322.6  
Debt Securities, Available-for-sale [2] 1,327.6 1,300.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 1.4 1.5  
Assets, Fair Value Disclosure 10,337.3 10,227.0  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.1 6.2  
Business Combination, Contingent Consideration, Liability 36.4 [7] 35.6  
Liabilities, Fair Value Disclosure 37.5 41.8  
Fair Value, Recurring [Member] | 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] 7.0 6.8  
Equity Securities [4] 8,571.6 8,530.4  
Debt Securities, Trading, and Equity Securities, FV-NI [1] 0.0 0.0  
Debt Securities, Available-for-sale [2] 0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 0.0 0.0  
Assets, Fair Value Disclosure 8,614.5 8,574.4  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0  
Business Combination, Contingent Consideration, Liability 0.0 [7] 0.0  
Liabilities, Fair Value Disclosure 0.0 0.0  
Fair Value, Recurring [Member] | 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 [1] 0.0 0.0  
Debt Securities, Available-for-sale 1,327.6 1,300.0 [2]  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 1.4 1.5  
Assets, Fair Value Disclosure 1,398.3 1,330.0  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.1 6.2  
Business Combination, Contingent Consideration, Liability 0.0 [7] 0.0  
Liabilities, Fair Value Disclosure 1.1 6.2  
Fair Value, Recurring [Member] | 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 [1] 324.5 322.6  
Debt Securities, Available-for-sale [2] 0.0 0.0  
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 0.0 0.0  
Assets, Fair Value Disclosure 324.5 322.6  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0  
Business Combination, Contingent Consideration, Liability 36.4 [7] 35.6  
Liabilities, Fair Value Disclosure 36.4 35.6  
Asset-backed Securities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 3.1 1.4  
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | 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  
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | 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] 3.1 1.4  
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | 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  
Commercial Paper [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 1.5 21.1  
Commercial Paper [Member] | Fair Value, Recurring [Member] | 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  
Commercial Paper [Member] | Fair Value, Recurring [Member] | 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] 1.5 21.1  
Commercial Paper [Member] | Fair Value, Recurring [Member] | 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  
Time Deposits [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 44.0 5.7  
Time Deposits [Member] | Fair Value, Recurring [Member] | 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 5.7  
Time Deposits [Member] | Fair Value, Recurring [Member] | 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] 44.0 0.0  
Time Deposits [Member] | Fair Value, Recurring [Member] | 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 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 35.9 31.5  
Money Market Funds [Member] | Fair Value, Recurring [Member] | 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] 35.9 31.5  
Money Market Funds [Member] | Fair Value, Recurring [Member] | 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 [Member] | 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 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 105.2 65.7  
Cash Equivalents [Member] | Fair Value, Recurring [Member] | 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] 35.9 37.2  
Cash Equivalents [Member] | Fair Value, Recurring [Member] | 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] 69.3 28.5  
Cash Equivalents [Member] | Fair Value, Recurring [Member] | 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 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure [8] 20.7 6.0  
US Treasury Securities | Fair Value, Recurring [Member] | 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    
US Treasury Securities | Fair Value, Recurring [Member] | 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] 20.7 6.0  
US Treasury Securities | Fair Value, Recurring [Member] | 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  
Foreign Government Debt [Member] | Fair Value, Recurring [Member] | 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 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 18.0 23.1  
Municipal Obligations (Member) | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Municipal Obligations (Member) | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 18.0 23.1  
Municipal Obligations (Member) | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Foreign Government Obligations [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 13.6 13.5  
Foreign Government Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Foreign Government Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 13.6 13.5  
Foreign Government Obligations [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 674.2 699.3  
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 674.2 699.3  
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 293.7 230.7  
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 293.7 230.7  
US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Asset-backed Securities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 328.1 333.4  
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 328.1 333.4  
Asset-backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0 0.0  
Short-term Investments [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities [4] 59.7 56.5  
Debt Securities, Available-for-sale [2] 1,327.6 1,300.0  
Short-term Investments [Member] | Municipal Obligations (Member) | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 18.0 23.1  
Short-term Investments [Member] | Foreign Government Obligations [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 13.6 13.5  
Short-term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 674.2 699.3  
Short-term Investments [Member] | US Government Sponsored Agencies [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 293.7 230.7  
Short-term Investments [Member] | Asset-backed Securities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 328.1 333.4  
Other Investments [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] 1.4 1.2  
Equity Securities [4] 8,511.9 8,473.9  
Restricted investment [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [3] $ 5.6 $ 5.6  
[1] The Loan under the fair value option is included in Other investments in the condensed consolidated balance sheets.
[2] Available-for-sale investments are included in Short-term investments in the condensed consolidatedbalance sheets.
[3] Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
March 31, 2023December 31, 2022
Restricted investments$5.6 $5.6 
Other investments1.4 1.2 
    Total$7.0 $6.8 
[4] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
March 31, 2023December 31, 2022
Short-term investments$59.7 $56.5 
Other investments8,511.9 8,473.9 
        Total$8,571.6 $8,530.4 
[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. Changes in the fair value of contingent consideration are included in Selling, general and administrative expenses in our condensed consolidated statements of income (loss).
[8] Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.