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2. Fair Value Measurements Fair Value Level Table (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized Gain on Securities $ 1,030.7 $ 2,210.1  
Debt Securities, Available-for-sale [1] 359.9 359.9  
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] 11,607.8 11,607.8 9,582.4
Debt Securities, Available-for-sale [1] 359.9 359.9 267.6
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [4] 0.7 0.7 1.0
Assets, Fair Value Disclosure 12,156.3 12,156.3 9,990.5
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [5] 0.5 0.5 1.0
Business Combination, Contingent Consideration, Liability [6] 0.1 0.1 0.7
Liabilities, Fair Value Disclosure 0.6 0.6 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] 11,607.8 11,607.8 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 11,717.3 11,717.3 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 359.9 359.9 267.6 [1]
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure [4] 0.7 0.7 1.0
Assets, Fair Value Disclosure 439.0 439.0 323.7
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure [5] 0.5 0.5 1.0
Business Combination, Contingent Consideration, Liability [6] 0.0 0.0 0.0
Liabilities, Fair Value Disclosure 0.5 0.5 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] 0.1 0.1 0.7
Liabilities, Fair Value Disclosure 0.1 0.1 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
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
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]     0.9
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
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] 68.4 68.4 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] 68.4 68.4 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] 33.8 33.8 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] 23.8 23.8 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] 78.9 78.9 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] 78.9 78.9 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] 181.1 181.1 132.8
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] 102.7 102.7 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] 78.4 78.4 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     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
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] 2.1 2.1 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] 2.1 2.1 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] 17.9 17.9 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] 17.9 17.9 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] 3.2 3.2 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] 3.2 3.2 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] 245.2 245.2 133.2
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] 245.2 245.2 133.2
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] 58.5 58.5 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] 58.5 58.5 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] 28.1 28.1 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] 28.1 28.1 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] 4.9 4.9  
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] 4.9 4.9  
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  
Other Current Liabilities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability [6] 0.0 0.0 0.6
Other Noncurrent Liabilities [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Contingent Consideration, Liability [6] 0.1 0.1 0.1
Short-term Investments [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities [3] 68.7 68.7 61.4
Debt Securities, Available-for-sale [1] 359.8 359.8 267.5
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] 2.1 2.1 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] 17.9 17.9 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] 3.2 3.2 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] 245.2 245.2 133.2
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] 58.5 58.5 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] 28.0 28.0 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] 11,539.1 11,539.1 9,521.0
Debt Securities, Available-for-sale [1] 0.1 0.1 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):
 June 30, 2021December 31, 2020
Short-term investments$359.8 $267.5 
Other investments0.1 0.1 
Total$359.9 $267.6 
[2] Restricted investments are included in the following accounts in the condensed consolidated balance sheets (in millions):
June 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):
June 30, 2021December 31, 2020
Short-term investments$68.7 $61.4 
Other investments11,539.1 9,521.0 
        Total$11,607.8 $9,582.4 
[4] Forward foreign exchange contracts in an asset position are included in other current assets in the condensed consolidated balance sheets.
[5] Forward foreign exchange contracts in a liability position are included in other current liabilities in the condensed consolidated balance sheets.
[6] Contingent consideration liability is included in the following accounts in the condensed consolidated balance sheets (in millions):
June 30, 2021December 31, 2020
Other current liabilities$— $0.6 
Other long-term liabilities0.1 0.1 
   Total$0.1 $0.7 
[7] Cash equivalents are included in Cash and cash equivalents in the condensed consolidated balance sheets.