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Business Combinations (Combination with Baxalta) (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jun. 03, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]              
Goodwill   $ 14,850.6 $ 4,289.6 $ 14,850.6 $ 4,289.6 $ 4,147.8 $ 2,474.9
Integration and acquisition costs   284.5 $ 89.9 738.6 $ (46.8)    
Baxalta              
Business Acquisition [Line Items]              
Purchase price paid per share of acquiree, in cash (in USD per share) | $ / shares $ 18            
Shares issued for acquisition (in shares) | shares 305.2            
Post acquisition revenues included in consolidated statement of income   1,586.4   2,166.7      
Goodwill $ 8,001.0            
Integration and acquisition costs   $ 254.1   $ 696.4      
Maximum amount of contingent cash consideration 1,500.0            
Contingent consideration payable 161.0            
Defined benefit net liability 610.4            
Fair value of plan assets $ 358.5            
Baxalta | ADS              
Business Acquisition [Line Items]              
Shire shares per Baxalta share 0.1482            
Baxalta | Common stock              
Business Acquisition [Line Items]              
Shire shares per Baxalta share 0.4446            
Currently marketed products | Baxalta              
Business Acquisition [Line Items]              
Other intangible assets, net $ 24,150.0            
Weighted average amortization period of acquired amortizable intangible assets 30 years            
In-Process Research and Development (IPR&D) | Baxalta              
Business Acquisition [Line Items]              
Other intangible assets, net $ 1,480.0            
Discount rate used in determining fair value of acquired in process research and development, low rate 10.00%            
Minimum | Currently marketed products | Baxalta              
Business Acquisition [Line Items]              
Estimated useful life of intangible assets 11 years            
Maximum | Currently marketed products | Baxalta              
Business Acquisition [Line Items]              
Estimated useful life of intangible assets 38 years