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Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
May 29, 2018
USD ($)
Dec. 31, 2018
USD ($)
reporting_unit
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Summary of Significant Accounting Policies [Line Items]          
Number of Reporting Units | reporting_unit   6      
Customer related acruals and allowances   $ 534.8 $ 512.3    
Depreciation   90.0 95.2 $ 100.2  
Property, Plant and Equipment, Gross [Abstract]          
Land   49.0 45.5    
Buildings   552.3 514.3    
Machinery and equipment   1,079.3 1,078.6    
Gross property, plant and equipment   1,680.6 1,638.4    
Less accumulated depreciation   (851.5) (805.3)    
Property, plant and equipment, net   829.1 833.1 870.1  
Research and development   218.6 167.7 184.0  
Advertising expense   $ 159.2 $ 145.3 $ 155.9  
CHCI          
Property, Plant and Equipment, Gross [Abstract]          
Omega advertising percentage   92.00%      
Minimum          
Summary of Significant Accounting Policies [Line Items]          
Previous years fiscal period (in weeks)     365 days    
Minimum | Machinery and Equipment          
Summary of Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years)   3 years      
Minimum | Building          
Summary of Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years)   10 years      
Maximum          
Summary of Significant Accounting Policies [Line Items]          
Previous years fiscal period (in weeks)     372 days    
Maximum | Machinery and Equipment          
Summary of Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years)   20 years      
Maximum | Building          
Summary of Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life (in years)   45 years      
Adjustments for New Accounting Pronouncement | Forecast | Minimum          
Property, Plant and Equipment, Gross [Abstract]          
ROU assets         $ 150.0
Lease liabilities         150.0
Adjustments for New Accounting Pronouncement | Forecast | Maximum          
Property, Plant and Equipment, Gross [Abstract]          
ROU assets         0.0
Lease liabilities         $ 170.0
Merck Sharp & Dohme License Agreement | CHCA          
Property, Plant and Equipment, Gross [Abstract]          
Research and development $ 50.0        
Foreign currency forward contracts          
Summary of Significant Accounting Policies [Line Items]          
Maximum remaining maturity of foreign currency derivatives   18 months 18 months