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Summary of Significant Accounting Policies and Implementation of New Financial Accounting Standards (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 11, 2019
Jan. 01, 2019
Jan. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Advertising expense $ 1,100.0 $ 900.0 $ 700.0      
Advertising expense, percentage of revenue 5.00% 5.00% 5.00%      
Operating lease, right-of-use asset $ 532.1       $ 530.0  
contract liabilities, reclassifed 264.6 $ 294.9        
Operating lease, liability 608.4       595.0  
Retained earnings 4,920.4 11,395.9        
Accumulated other comprehensive loss 6,523.6 5,729.2        
Deferred tax assets $ 385.1 $ 1,301.1        
Discontinued Operations, Disposed of by Sale | Elanco            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposition of ownership interest       80.20%    
Accounting Standards Update 2016-02            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
contract liabilities, reclassifed         $ (65.0)  
Accounting Standards Update 2014-09            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Retained earnings           $ 5.0
Accounting Standards Update 2016-01            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Retained earnings           105.0
Accumulated other comprehensive loss           105.0
Accounting Standards Update 2016-16            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Retained earnings           700.0
Deferred tax assets           2,500.0
Deferred tax liabilities           $ 1,800.0
Accounting Standards Update 2018-02            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Retained earnings     $ 643.6