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3. Fair Value Measurements (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Trading, and Equity Securities, FV-NI $ 322.6 [1] € 400.0 $ 443.1 [1]
Debt Securities, Available-for-sale [2] 1,300.0    
Business Combination, Contingent Consideration, Liability [3] 36.1    
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]      
Equity Securities, FV-NI, Unrealized Loss (5,070.0)    
Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [4] 6.8   6.9
Equity Securities, FV-NI [5] 8,530.4   13,977.5
Debt Securities, Trading, and Equity Securities, FV-NI [1] 322.6   443.1
Debt Securities, Available-for-sale 1,300.0   327.7
Forward foreign exchange contracts, Asset [6] 1.5   1.7
Financial Assets Carried at Fair Value 10,227.0   14,899.5
Forward foreign exchange contracts, Liability [7] 6.2   2.8
Business Combination, Contingent Consideration, Liability [3] 35.6    
Liabilities, Fair Value Disclosure     2.8
Fair Value, Recurring [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 333.4   87.3
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 699.3   182.3
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 230.7   44.3
Fair Value, Recurring [Member] | Foreign Government Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 13.5   1.0
Fair Value, Recurring [Member] | Foreign Government Debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2]     3.8
Fair Value, Recurring [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 23.1   9.0
Fair Value, Recurring [Member] | Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 21.1   39.8
Fair Value, Recurring [Member] | Time Deposits [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 5.7   17.3
Fair Value, Recurring [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 1.4   0.1
Fair Value, Recurring [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 31.5   50.7
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 6.0   33.6
Fair Value, Recurring [Member] | Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 65.7   142.6
Fair Value, Recurring [Member] | 8888 Foreign Governments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     0.8
Fair Value, Recurring [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     0.3
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 [4] 6.8   6.9
Equity Securities, FV-NI [5] 8,530.4   13,977.5
Debt Securities, Trading, and Equity Securities, FV-NI [1] 0.0   0.0
Debt Securities, Available-for-sale 0.0   0.0
Forward foreign exchange contracts, Asset [6] 0.0   0.0
Financial Assets Carried at Fair Value 8,574.4   14,042.3
Forward foreign exchange contracts, Liability [7] 0.0   0.0
Business Combination, Contingent Consideration, Liability [3] 0.0    
Liabilities, Fair Value Disclosure     0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2]     0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Time Deposits [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 5.7   7.2
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 31.5   50.7
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 37.2   57.9
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | 8888 Foreign Governments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     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 [4] 0.0   0.0
Equity Securities, FV-NI [5] 0.0   0.0
Debt Securities, Trading, and Equity Securities, FV-NI [1] 0.0   0.0
Debt Securities, Available-for-sale 1,300.0   327.7
Forward foreign exchange contracts, Asset [6] 1.5   1.7
Financial Assets Carried at Fair Value 1,330.0   414.1
Forward foreign exchange contracts, Liability [7] 6.2   2.8
Business Combination, Contingent Consideration, Liability [3] 0.0    
Liabilities, Fair Value Disclosure     2.8
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 333.4   87.3
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 699.3   182.3
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 230.7   44.3
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 13.5   1.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2]     3.8
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 23.1   9.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 21.1   39.8
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   10.1
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 1.4   0.1
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 6.0   33.6
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 28.5   84.7
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | 8888 Foreign Governments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     0.8
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     0.3
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 [4] 0.0   0.0
Equity Securities, FV-NI [5] 0.0   0.0
Debt Securities, Trading, and Equity Securities, FV-NI [1] 322.6   443.1
Debt Securities, Available-for-sale 0.0   0.0
Forward foreign exchange contracts, Asset [6] 0.0   0.0
Financial Assets Carried at Fair Value 322.6   443.1
Forward foreign exchange contracts, Liability [7] 0.0   0.0
Business Combination, Contingent Consideration, Liability [3] 35.6    
Liabilities, Fair Value Disclosure     0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2]     0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Time Deposits [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8] 0.0   0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | 8888 Foreign Governments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     0.0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [8]     0.0
Fair value of Appreciation rights      
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]      
Investment Owned, Unrecognized Unrealized Depreciation 75.0    
Short-term Investments [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities, FV-NI 56.5   71.4
Short-term Investments [Member] | Fair Value, Recurring [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 333.4   87.4
Short-term Investments [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 699.3   182.2
Short-term Investments [Member] | Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 230.7   44.3
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 13.5   1.0
Short-term Investments [Member] | Fair Value, Recurring [Member] | Foreign Government Debt [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2]     3.8
Short-term Investments [Member] | Fair Value, Recurring [Member] | Municipal Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 23.1   9.0
Short-term Investments [Member] | Fair Value, Recurring [Member] | Debt Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [2] 1,300.0   327.7
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 1.2   1.3
Equity Securities, FV-NI 8,473.9   13,906.1
Restricted investment | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value $ 5.6   $ 5.6
[1] The Loan under the fair value option is included in Other investments in the consolidated balance sheets.
[2] Available-for-sale investments are included in Short-term investments in the consolidated balance sheets.
[3] Contingent considerations in a liability position are included in Other long-term liabilities in the consolidated balance sheets.
[4] Restricted investments are included in the following accounts in the consolidated balance sheets (in millions):
December 31, 2022December 31, 2021
Restricted investments$5.6 $5.6 
Other investments1.21.3 
   Total$6.8 $6.9 
[5] Equity securities are included in the following accounts in the consolidated balance sheets (in millions):
December 31, 2022December 31, 2021
Short-term investments$56.5 $71.4 
Other investments8,473.9 13,906.1 
   Total$8,530.4 $13,977.5 
[6] Forward foreign exchange contracts in an asset position are included in Other current assets in the consolidated balance sheets.
[7] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the consolidated balance sheets.
[8] Cash equivalents are included in Cash and cash equivalents in the consolidated balance sheets.