Balance Sheet Components (Other Current Liabilities) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Schedule of other current liabilities [Line Items]
Opioid Assessment	$ 100.0
Payments for Legal Settlements	472.7
Accrued sales allowances	631.9	$ 818.0
Legal and professional accruals, including litigation accruals	131.4	241.1
Payroll and employee benefit liabilities	372.4	404.6
Contingent consideration	418.8	453.7
Restructuring	80.9	91.5
Other Accrued Liabilities, Current	742.2	1,111.4
Accrued interest	193.8	42.3
Fair value of financial instruments	114.4	31.1
Other current liabilities	2,528.4	2,964.5
Clean energy investments
Schedule of other current liabilities [Line Items]
Other current liabilities	38.1	56.7
Prepaid expenses and other current assets
Schedule of other current liabilities [Line Items]
Contingent consideration	$ 223.3	$ 167.8