Commitments and Contingencies (Commitments and Loss Contingency) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Legal Matters [Line Items]
Provisions for litigation loss, insurance claims and other disputes	$ 130.5	$ 36.9
Settlement costs related to agreement in principle to resolve a civil subpoena
Legal Matters [Line Items]
Provisions for litigation loss, insurance claims and other disputes	57.5
Settlement costs related to ADDERALL XR supply agreement dispute
Legal Matters [Line Items]
Provisions for litigation loss, insurance claims and other disputes	48.0
Clinical Testing
Commitment [Line Items]
Commitment amount	424.7	358.6
Contract Manufacturing
Commitment [Line Items]
Commitment amount	125.2	86.4
Other Purchasing Commitment
Commitment [Line Items]
Commitment amount	144.7	190.1
Commitments expected to be paid in next year	141.5
Investment Commitment
Commitment [Line Items]
Commitment amount	15.2	9.4
Capital Commitment
Commitment [Line Items]
Commitment amount	$ 97.0	$ 25.4