Integration and Acquisition Costs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Integration and acquisition costs	$ 343.7	$ 363.0	$ 459.7	$ 454.1
Baxalta
Business Acquisition [Line Items]
Integration and acquisition costs	192.4		310.9
Employee severance and acceleration of stock compensation
Business Acquisition [Line Items]
Integration and acquisition costs		254.5		265.5
Employee severance and acceleration of stock compensation | Baxalta
Business Acquisition [Line Items]
Integration costs	80.2		117.1
Third-party professional fees
Business Acquisition [Line Items]
Integration and acquisition costs	79.2			89.2
Third-party professional fees | Baxalta
Business Acquisition [Line Items]
Integration costs	50.4		85.6
Facility consolidations | Baxalta
Business Acquisition [Line Items]
Integration costs	17.2		41.7
Asset impairments
Business Acquisition [Line Items]
Integration and acquisition costs	25.4
Asset impairments | Baxalta
Business Acquisition [Line Items]
Integration costs	33.7		33.6
Acquisition-related costs (including legal, investment banking, and other transaction-related fees)
Business Acquisition [Line Items]
Integration and acquisition costs		67.1		125.6
Change in fair value of contingent consideration
Business Acquisition [Line Items]
Integration and acquisition costs	$ 151.2	$ 56.5	$ 147.7	$ 45.1