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2. Fair Value Measurements Fair Value Level Table (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Aug. 03, 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] $ 247.7 $ 247.7   $ 443.1
Debt Securities, Available-for-sale [2] 1,280.2 1,280.2    
Business Combination, Contingent Consideration, Liability 36.1 [3] 36.1 [3] $ 36.1  
Fair Value, Option, Changes in Fair Value, Gain (Loss) 19.4 (149.0) [1]    
Foreign exchange (gains) losses, net [1]   (46.4)    
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 20.0 63.8 [1]    
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 [4] 6.8 6.8   $ 6.9
Equity Securities [5] 7,224.6 7,224.6   13,977.5
Debt Securities, Trading, and Equity Securities, FV-NI [1] 247.7 247.7   443.1
Debt Securities, Available-for-sale [2] 1,280.2 1,280.2   327.7
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [6] 3.5 3.5   1.7
Assets, Fair Value Disclosure 8,891.0 8,891.0   14,899.5
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [7] 7.5 7.5   2.8
Business Combination, Contingent Consideration, Liability [3] 36.1 36.1    
Liabilities, Fair Value Disclosure 43.6 43.6   2.8
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 [4] 6.8 6.8   6.9
Equity Securities [5] 7,224.6 7,224.6   13,977.5
Debt Securities, Trading, and Equity Securities, FV-NI [1] 0.0 0.0   0.0
Debt Securities, Available-for-sale [2] 0.0 0.0   0.0
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [6] 0.0 0.0   0.0
Assets, Fair Value Disclosure 7,310.9 7,310.9   14,042.3
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [7] 0.0 0.0   0.0
Business Combination, Contingent Consideration, Liability [3] 0.0 0.0    
Liabilities, Fair Value Disclosure 0.0 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 [4] 0.0 0.0   0.0
Equity Securities [5] 0.0 0.0   0.0
Debt Securities, Trading, and Equity Securities, FV-NI [1] 0.0 0.0   0.0
Debt Securities, Available-for-sale 1,280.2 1,280.2   327.7 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [6] 3.5 3.5   1.7
Assets, Fair Value Disclosure 1,332.4 1,332.4   414.1
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [7] 7.5 7.5   2.8
Business Combination, Contingent Consideration, Liability [3] 0.0 0.0    
Liabilities, Fair Value Disclosure 7.5 7.5   2.8
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   0.0
Equity Securities [5] 0.0 0.0   0.0
Debt Securities, Trading, and Equity Securities, FV-NI [1] 247.7 247.7   443.1
Debt Securities, Available-for-sale [2] 0.0 0.0   0.0
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [6] 0.0 0.0   0.0
Assets, Fair Value Disclosure 247.7 247.7   443.1
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [7] 0.0 0.0   0.0
Business Combination, Contingent Consideration, Liability [3] 36.1 36.1    
Liabilities, Fair Value Disclosure 36.1 36.1   0.0
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] 4.5 4.5   0.1
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   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] 4.5 4.5   0.1
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   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] 24.7 24.7   39.8
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   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] 24.7 24.7   39.8
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   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] 18.2 18.2   17.3
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] 18.2 18.2   7.2
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] 0.0 0.0   10.1
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   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] 61.3 61.3   50.7
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] 61.3 61.3   50.7
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   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   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] 128.2 128.2   142.6
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] 79.5 79.5   57.9
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] 48.7 48.7   84.7
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   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] 19.5 19.5   33.6
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 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] 19.5 19.5   33.6
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   0.0
Foreign Government Debt [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]       0.8
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
Foreign Government Debt [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]       0.8
Foreign Government Debt [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
Municipal Notes | 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]       0.3
Municipal Notes | 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 Notes | 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]       0.3
Municipal Notes | 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
Foreign Government Debt [Member] | Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale [2]       3.8
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]        
Debt Securities, Available-for-sale [2]       0.0
Foreign Government Debt [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]       3.8
Foreign Government Debt [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
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] 36.2 36.2   9.0
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   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] 36.2 36.2   9.0
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   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] 14.1 14.1   1.0
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   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] 14.1 14.1   1.0
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   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] 665.1 665.1   182.3
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   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] 665.1 665.1   182.3
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   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] 224.5 224.5   44.3
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   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] 224.5 224.5   44.3
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   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] 340.3 340.3   87.3
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   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] 340.3 340.3   87.3
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   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 [5] 52.0 52.0   71.4
Debt Securities, Available-for-sale [2] 1,280.2 1,280.2   327.7
Short-term Investments [Member] | Foreign Government Debt [Member] | Fair Value, Recurring [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] | 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] 36.2 36.2   9.0
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] 14.1 14.1   1.0
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] 665.1 665.1   182.2
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] 224.5 224.5   44.3
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] 340.3 340.3   87.4
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 [4] 1.2 1.2   1.3
Equity Securities [5] 7,172.6 7,172.6   13,906.1
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 [4] $ 5.6 $ 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] Contingent considerations in a liability position are included in Other long-term liabilities in the condensed consolidated balance sheets.
[4] Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
September 30, 2022December 31, 2021
Restricted investments$5.6 $5.6 
Other investments1.2 1.3 
    Total$6.8 $6.9 
[5] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
September 30, 2022December 31, 2021
Short-term investments$52.0 $71.4 
Other investments7,172.6 13,906.1 
        Total$7,224.6 $13,977.5 
[6] Forward foreign exchange contracts in an asset position are included in Other current assets in the condensed consolidated balance sheets.
[7] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the condensed consolidated balance sheets.
[8] Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.