Balance Sheet Components (Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Prepaid expenses	$ 166.9	$ 194.6
Fair value of financial instruments	174.7	134.7
Equity securities	45.1	42.6
Other current assets	1,195.4	1,404.0
Prepaid expenses and other current assets	1,784.7	1,811.2
Biocon Biologics
Property, Plant and Equipment [Line Items]
Disposal Group, Including Discontinued Operation, Deferred Consideration Due	148.5	299.5
Biocon Biologics | Other Current Assets
Property, Plant and Equipment [Line Items]
Disposal Group, Including Discontinued Operation, Deferred Consideration Due	167.5	0.0
Available-for-sale fixed income investments
Property, Plant and Equipment [Line Items]
Available-for-sale securities	$ 35.1	$ 35.3