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3. Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Apr. 01, 2020
Dec. 31, 2019
Oct. 01, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity Securities, FV-NI, Unrealized Gain $ 4,495.8      
Debt Securities, Available-for-sale 267.6      
Business Combination, Contingent Consideration, Liability   $ 0.1   $ 0.6
Analytical Flow Cytometer Platform [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability 0.0      
Distributor [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability 0.6      
Celsee [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability 0.1 $ 0.1    
Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted Investments, at Fair Value 6.7   $ 5.6  
Equity Securities, FV-NI 9,582.4   4,664.4  
Debt Securities, Available-for-sale 267.6   402.9  
Forward foreign exchange contracts, Asset [1] 1.0   0.9  
Financial Assets Carried at Fair Value 9,990.5   5,227.9  
Forward foreign exchange contracts, Liability [2] 1.0   1.0  
Business Combination, Contingent Consideration, Liability [3] 0.7   4.9  
Liabilities, Fair Value Disclosure 1.7   5.9  
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 36.2   72.9  
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 133.2   204.5  
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 76.9   106.1  
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 4.0   4.7  
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 2.1   3.1  
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 15.2   11.6  
Fair Value, Recurring [Member] | Debt Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale 267.6   402.9  
Fair Value, Recurring [Member] | Commercial Paper [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents [4] 41.7   42.9  
Fair Value, Recurring [Member] | Time Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents [4] 27.6   41.2  
Fair Value, Recurring [Member] | Asset-backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 0.9   0.1 [4]  
Fair Value, Recurring [Member] | Money Market Funds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents [4] 60.1   69.9  
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 2.5      
Fair Value, Recurring [Member] | Cash Equivalents [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents [4] 132.8   154.1  
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 6.7   5.6  
Equity Securities, FV-NI 9,582.4   4,664.4  
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 9,666.8   4,771.1  
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] | 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] | 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] | Foreign Government Debt [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] | 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] | Time Deposits [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents [4] 17.6   31.2  
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 1 [Member] | Money Market Funds [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents [4] 60.1   69.9  
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]        
Cash equivalents 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] 77.7   101.1  
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 267.6   402.9  
Forward foreign exchange contracts, Asset [1] 1.0   0.9  
Financial Assets Carried at Fair Value 323.7   456.8  
Forward foreign exchange contracts, Liability [2] 1.0   1.0  
Business Combination, Contingent Consideration, Liability [3] 0.0   0.0  
Liabilities, Fair Value Disclosure 1.0   1.0  
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 36.2   72.9  
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 133.2   204.5  
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 76.9   106.1  
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 4.0   4.7  
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 2.1   3.1  
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 15.2   11.6  
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] 41.7   42.9  
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] | Asset-backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 0.9   0.1  
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] | US Government Sponsored Agencies [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 2.5      
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] 55.1   53.0  
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 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] 0.7   4.9  
Liabilities, Fair Value Disclosure 0.7   4.9  
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] | 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] | Foreign Government Debt [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] | 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] | 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] | 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 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] | US Government Sponsored Agencies [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents 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  
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 0.6   3.3  
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 61.4   51.0  
Debt Securities, Available-for-sale 267.5   402.8  
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 36.1   72.8  
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 133.2   204.5  
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 76.9   106.1  
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 4.0   4.7  
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 2.1   3.1  
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 15.2   11.6  
Short-term Investments [Member] | Fair Value, Recurring [Member] | Debt Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale 267.5   402.8  
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 1.1   0.0  
Equity Securities, FV-NI 9,521.0   4,613.4  
Debt Securities, Available-for-sale 0.1   0.1  
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 0.1   1.6  
Restricted investment | 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  
Other Long-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 0.1   0.1  
Other Long-term Investments [Member] | Fair Value, Recurring [Member] | Debt Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Securities, Available-for-sale $ 0.1   $ 0.1  
[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, 2020December 31, 2019
Other current liabilities$0.6 $3.3 
Other long-term liabilities0.1 1.6 
   Total$0.7 $4.9 
[4] Cash equivalents are included in Cash and cash equivalents in the consolidated balance sheets.