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2. Fair Value Measurements Fair Value Level Table (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized Gain on Securities $ 4,868.7 $ 7,078.8  
Debt Securities, Available-for-sale [1] 409.1 409.1  
Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Restricted Investments, at Fair Value [2] 6.8 6.8 $ 6.7
Equity Securities [3] 16,259.1 16,259.1 9,582.4
Debt Securities, Available-for-sale [1] 409.1 409.1 267.6
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [4] 0.6 0.6 1.0
Assets, Fair Value Disclosure 16,884.8 16,884.8 9,990.5
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [5] 0.8 0.8 1.0
Business Combination, Contingent Consideration, Liability [6] 0.0 0.0 0.7
Liabilities, Fair Value Disclosure 0.8 0.8 1.7
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 [2] 6.8 6.8 6.7
Equity Securities [3] 16,259.1 16,259.1 9,582.4
Debt Securities, Available-for-sale [1] 0.0 0.0 0.0
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [4] 0.0 0.0 0.0
Assets, Fair Value Disclosure 16,414.4 16,414.4 9,666.8
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [5] 0.0 0.0 0.0
Business Combination, Contingent Consideration, Liability [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 [2] 0.0 0.0 0.0
Equity Securities [3] 0.0 0.0 0.0
Debt Securities, Available-for-sale 409.1 409.1 267.6 [1]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [4] 0.6 0.6 1.0
Assets, Fair Value Disclosure 470.4 470.4 323.7
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [5] 0.8 0.8 1.0
Business Combination, Contingent Consideration, Liability [6] 0.0 0.0 0.0
Liabilities, Fair Value Disclosure 0.8 0.8 1.0
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 [2] 0.0 0.0 0.0
Equity Securities [3] 0.0 0.0 0.0
Debt Securities, Available-for-sale [1] 0.0 0.0 0.0
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [4] 0.0 0.0 0.0
Assets, Fair Value Disclosure 0.0 0.0 0.0
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [5] 0.0 0.0 0.0
Business Combination, Contingent Consideration, Liability [6] 0.0 0.0 0.7
Liabilities, Fair Value Disclosure 0.0 0.0 0.7
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]      
Cash and Cash Equivalents, Fair Value Disclosure 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]      
Cash and Cash Equivalents, Fair Value Disclosure [7]     0.9
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] 0.4 0.4 0.9
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] 33.3 33.3 41.7
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] 33.3 33.3 41.7
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] 29.5 29.5 27.6
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] 19.5 19.5 17.6
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] 10.0 10.0 10.0
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 [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] 129.0 129.0 60.1
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] 129.0 129.0 60.1
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] 209.2 209.2 132.8
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] 148.5 148.5 77.7
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] 60.7 60.7 55.1
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, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and Cash Equivalents, Fair Value Disclosure     2.5
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 17.0 17.0 2.5
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 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]      
Debt Securities, Available-for-sale [1] 5.6 5.6 2.1
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 [1] 0.0 0.0 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 [1] 5.6 5.6 2.1
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 [1] 0.0 0.0 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 [1] 19.4 19.4 15.2
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 [1] 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 [1] 19.4 19.4 15.2
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 [1] 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 [1] 1.9 1.9 4.0
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 [1] 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 [1] 1.9 1.9 4.0
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 [1] 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 [1] 231.5 231.5 133.2
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 [1] 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 [1] 231.5 231.5 133.2
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 [1] 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 [1] 66.1 66.1 76.9
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 [1] 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 [1] 66.1 66.1 76.9
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 [1] 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 [1] 68.9 68.9 36.2
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 [1] 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 [1] 68.9 68.9 36.2
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 [1] 0.0 0.0 0.0
Certificates of Deposit | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt Securities, Available-for-sale [1] 15.7 15.7  
Certificates of Deposit | 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 [1] 0.0 0.0  
Certificates of Deposit | 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 [1] 15.7 15.7  
Certificates of Deposit | 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 [1] 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 [3] 68.2 68.2 61.4
Debt Securities, Available-for-sale [1] 409.1 409.1 267.5
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 [1] 5.6 5.6 2.1
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 [1] 19.4 19.4 15.2
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 [1] 1.9 1.9 4.0
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 [1] 231.5 231.5 133.2
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 [1] 66.1 66.1 76.9
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 [1] 68.9 68.9 36.1
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 [2] 1.2 1.2 1.1
Equity Securities [3] 16,190.9 16,190.9 9,521.0
Debt Securities, Available-for-sale [1] 0.0 0.0 0.1
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 [2] $ 5.6 $ 5.6 $ 5.6
[1] Available-for-sale investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
 September 30, 2021December 31, 2020
Short-term investments$409.1 $267.5 
Other investments— 0.1 
Total$409.1 $267.6 
[2] Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
September 30, 2021December 31, 2020
Restricted investments$5.6 $5.6 
Other investments1.2 1.1 
    Total$6.8 $6.7 
[3] Equity securities are included in the following accounts in the condensed consolidated balance sheets (in millions):
September 30, 2021December 31, 2020
Short-term investments$68.2 $61.4 
Other investments16,190.9 9,521.0 
        Total$16,259.1 $9,582.4 
[4] Forward foreign exchange contracts in an asset position are included in other current assets in the condensed consolidated balance sheets.
[5] Forward foreign exchange contracts in a liability position are included in other current liabilities in the condensed consolidated balance sheets.
[6] Contingent consideration liabilities in a liability position are included in the other long-term liabilities in the condensed consolidated balance sheets.
[7] Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.