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Balance Sheet Components (Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Prepaid expenses $ 205.8 $ 194.6
Fair value of financial instruments 94.6 134.7
Equity securities 46.7 42.6
Other current assets 1,177.7 1,404.0
Prepaid expenses and other current assets 1,725.1 1,811.2
Biocon Biologics    
Property, Plant and Equipment [Line Items]    
Deferred consideration due from Biocon Biologics 146.1 299.5
Biocon Biologics | Other Current Assets    
Property, Plant and Equipment [Line Items]    
Deferred consideration due from Biocon Biologics 164.8 0.0
Available-for-sale fixed income investments    
Property, Plant and Equipment [Line Items]    
Available-for-sale fixed income securities $ 35.5 $ 35.3