Accounts Payable and Accrued Expenses (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts Payable and Accrued Liabilities, Current [Line Items]
Trade accounts payable and accrued purchases	$ 259.6	$ 234.7
Accrued rebate - Medicaid	409.8	379.6
Accrued rebate - Managed care	202.8	170.3
Sales return reserve	88.8	69.8
Accrued bonuses	103.0	91.6
Accrued employee compensation and benefits payable	59.3	48.1
R&D accruals	52.7	60.7
Marketing accruals	18.2	26.5
Other accrued expenses	176.3	158.0
Accounts payable and accrued expenses, total	1,370.5	1,239.3
Uncertainty, Medicaid Rebate Accrual Methodology
Change in Accounts Payable and Accrued Expenses
Potential maximum amount of additional liabilities	212
Uncertainty, Medicaid Rebate Accrual Methodology | ADDERALL XR
Change in Accounts Payable and Accrued Expenses
Potential amount of additional liabilities	$ 134