Balance Sheet Components (Other Current Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of other current liabilities [Line Items]
Accrued sales allowances	$ 876.6	$ 570.7
Payroll and employee benefit liabilities	844.5	746.8
Legal and professional accruals, including litigation accruals	244.0	297.2
Contingent consideration	215.1	375.0	$ 199.7
Accrued restructuring	36.4	95.3
Accrued interest	66.8	80.2
Fair value of financial instruments	124.6	187.0
Operating lease liability	83.0	80.6
Due to Biocon Biologics	275.1	0.0
Other	898.4	978.1
Other current liabilities	3,393.9	3,440.9
Biocon Biologics
Schedule of other current liabilities [Line Items]
Due to Biocon Biologics	23.8	22.5
Variable Consideration
Schedule of other current liabilities [Line Items]
Accrued sales allowances	996.3	888.8
Other current liabilities
Schedule of other current liabilities [Line Items]
Contingent consideration	$ 76.1	$ 64.4	$ 66.7