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2. Fair Value Measurements Fair Value Level Table (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized Gain on Securities $ (1,280.0)    
Debt Securities, Trading, and Equity Securities, FV-NI [1] 286.7 $ 286.7 $ 443.1
Debt Securities, Available-for-sale [2] 1,315.8 1,315.8  
Fair Value, Option, Changes in Fair Value, Gain (Loss) [1]   (129.6)  
Foreign exchange (gains) losses, net [1]   (26.8)  
Fair Value, Option, Loans Held as Assets [Abstract]      
Investment Owned, Unrecognized Unrealized Appreciation (Depreciation), Net [1] (85.9) (85.9)  
Debt Securities [1]     $ 400.0
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions [1]   (43.7)  
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] 6.9 6.9 $ 6.9
Equity Securities [4] 7,815.4 7,815.4 13,977.5
Debt Securities, Trading, and Equity Securities, FV-NI [1] 286.7 286.7 443.1
Debt Securities, Available-for-sale [2] 1,315.8 1,315.8 327.7
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 3.7 3.7 1.7
Assets, Fair Value Disclosure 9,634.6 9,634.6 14,899.5
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.2 1.2 2.8
Liabilities, Fair Value Disclosure 1.2 1.2 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 [3] 6.9 6.9 6.9
Equity Securities [4] 7,815.4 7,815.4 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 [5] 0.0 0.0 0.0
Assets, Fair Value Disclosure 7,958.1 7,958.1 14,042.3
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 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 [3] 0.0 0.0 0.0
Equity Securities [4] 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 1,315.8 1,315.8 327.7 [2]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 3.7 3.7 1.7
Assets, Fair Value Disclosure 1,389.8 1,389.8 414.1
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 1.2 1.2 2.8
Liabilities, Fair Value Disclosure 1.2 1.2 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 [3] 0.0 0.0 0.0
Equity Securities [4] 0.0 0.0 0.0
Debt Securities, Trading, and Equity Securities, FV-NI [1] 286.7 286.7 443.1
Debt Securities, Available-for-sale [2] 0.0 0.0 0.0
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [5] 0.0 0.0 0.0
Assets, Fair Value Disclosure 286.7 286.7 443.1
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [6] 0.0 0.0 0.0
Liabilities, Fair Value Disclosure 0.0 0.0 0.0
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]      
Cash and Cash Equivalents, Fair Value Disclosure [7] 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]      
Cash and Cash Equivalents, Fair Value Disclosure [7] 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 [7] 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 [7] 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 [7] 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 [7] 56.8 56.8 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 [7] 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 [7] 56.8 56.8 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 [7] 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 [7] 36.3 36.3 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 [7] 36.3 36.3 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 [7] 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 [7] 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 [7] 99.5 99.5 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 [7] 99.5 99.5 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 [7] 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 [7] 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 [7] 206.1 206.1 142.6
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 [7] 135.8 135.8 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 [7] 70.3 70.3 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 [7] 0.0 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] 9.0 9.0  
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 [7]     33.6
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 [7] 9.0 9.0 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 [7] 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 [7]     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 [7]     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 [7]     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 [7]     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 [7]     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 [7]     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 [7]     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 [7]     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] 27.4 27.4 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] 27.4 27.4 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] 10.1 10.1 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] 10.1 10.1 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] 692.2 692.2 182.3
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] 692.2 692.2 182.3
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] 227.4 227.4 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] 227.4 227.4 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] 358.7 358.7 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] 358.7 358.7 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 [4] 55.2 55.2 71.4
Debt Securities, Available-for-sale [2] 1,315.8 1,315.8 327.7
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] 27.4 27.4 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] 10.1 10.1 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] 692.2 692.2 182.2
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] 227.4 227.4 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] 358.7 358.7 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 [3] 1.3 1.3 1.3
Equity Securities [4] 7,760.2 7,760.2 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 [3] $ 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 consolidated balance sheets.
[3] Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
June 30, 2022December 31, 2021
Restricted investments$5.6 $5.6 
Other investments1.3 1.3 
    Total$6.9 $6.9 
[4] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
June 30, 2022December 31, 2021
Short-term investments$55.2 $71.4 
Other investments7,760.2 13,906.1 
        Total$7,815.4 $13,977.5 
[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.