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3. Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Oct. 01, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities, FV-NI, Unrealized Gain $ 2,031.1    
Debt Securities, Available-for-sale 402.9    
Business Combination, Contingent Consideration, Liability   $ 0.6  
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
Equity Securities, FV-NI 4,664.4   2,672.9
Debt Securities, Available-for-sale 402.9   373.2
Forward foreign exchange contracts, Asset [1] 0.9   0.6
Financial Assets Carried at Fair Value 5,227.9   3,200.0
Forward foreign exchange contracts, Liability [2] 1.0   0.7
Business Combination, Contingent Consideration, Liability [3] 4.9   8.4
Liabilities, Fair Value Disclosure 5.9   9.1
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 3.1    
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 204.5   215.0
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 106.1   80.3
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 4.7   3.6
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 11.6   11.0
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 72.9   63.3
Fair Value, Recurring [Member] | Time Deposits [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [4] 41.2   32.7
Fair Value, Recurring [Member] | Money Market Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [4] 69.9   36.9
Fair Value, Recurring [Member] | Commercial Paper [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [4] 42.9   77.8
Fair Value, Recurring [Member] | Cash Equivalents [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents [4] 154.1   147.7
Fair Value, Recurring [Member] | Asset-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 0.1   0.3 [4]
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 5.6   5.6
Equity Securities, FV-NI 4,664.4   2,672.9
Debt Securities, Available-for-sale 0.0   0.0
Forward foreign exchange contracts, Asset [1] 0.0   0.0
Financial Assets Carried at Fair Value 4,771.1   2,738.1
Forward foreign exchange contracts, Liability [2] 0.0   0.0
Business Combination, Contingent Consideration, Liability [3] 0.0   0.0
Liabilities, Fair Value Disclosure 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 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 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 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 0.0   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 0.0   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 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 [4] 31.2   22.7
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 [4] 69.9   36.9
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 [4] 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 [4] 101.1   59.6
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 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 0.0   0.0
Equity Securities, FV-NI 0.0   0.0
Debt Securities, Available-for-sale 402.9   373.2
Forward foreign exchange contracts, Asset [1] 0.9   0.6
Financial Assets Carried at Fair Value 456.8   461.9
Forward foreign exchange contracts, Liability [2] 1.0   0.7
Business Combination, Contingent Consideration, Liability [3] 0.0   0.0
Liabilities, Fair Value Disclosure 1.0   0.7
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 3.1    
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 204.5   215.0
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]      
Debt Securities, Available-for-sale 106.1   80.3
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 4.7   3.6
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 11.6   11.0
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 72.9   63.3
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 [4] 10.0   10.0
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 [4] 0.0   0.0
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 [4] 42.9   77.8
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 [4] 53.0   88.1
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 0.1   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 0.0   0.0
Equity Securities, FV-NI 0.0   0.0
Debt Securities, Available-for-sale 0.0   0.0
Forward foreign exchange contracts, Asset [1] 0.0   0.0
Financial Assets Carried at Fair Value 0.0   0.0
Forward foreign exchange contracts, Liability [2] 0.0   0.0
Business Combination, Contingent Consideration, Liability [3] 4.9   8.4
Liabilities, Fair Value Disclosure 4.9   8.4
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 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 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 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 0.0   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 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]      
Debt Securities, Available-for-sale 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 [4] 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 [4] 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 [4] 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 [4] 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 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 3.3   3.2
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 51.0   40.2
Debt Securities, Available-for-sale 402.8   373.0
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 3.1    
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 204.5   215.0
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 106.1   80.3
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 4.7   3.6
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 11.6   11.0
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 72.8   63.1
Other Investments [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities, FV-NI 4,613.4   2,632.7
Debt Securities, Available-for-sale 0.1   0.2
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 $ 1.6   $ 5.2
[1]
Forward foreign exchange contracts in an asset position are included in Other current assets in the Consolidated Balance Sheets.
[2]
Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Consolidated Balance Sheets.
[3]
Contingent consideration liabilities are included in the following accounts in the Consolidated Balance Sheets (in millions):
 
December 31, 2019
 
December 31, 2018
 
 
 
 
Other current liabilities
$
3.3

 
$
3.2

Other long-term liabilities
1.6

 
5.2

   Total
$
4.9

 
$
8.4
[4]

(a)
Cash equivalents are included in Cash and cash equivalents in the Consolidated Balance Sheets.