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Acquisitions (Schedule Of Acquired Other Identifiable Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 02, 2017
Sep. 01, 2017
Sep. 12, 2016
Feb. 02, 2016
Apr. 17, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets Acquired [Line Items]                  
Goodwill           $ 1,541.4 $ 1,376.4 $ 1,114.5 $ 1,192.8
Intangible assets acquired           72.0 162.5    
Customer relationships                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired           $ 24.4 $ 69.0    
Weighted average useful life           13 years      
Forage Division, Lely Group [Member]                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Current assets $ 84.6                
Property, plant and equipment 24.3                
Intangible assets 7.6                
Goodwill 17.4                
Total assets acquired 133.9                
Current liabilities 23.6                
Long-term liabilities 8.2                
Total liabilities assumed 31.8                
Net assets acquired 102.1                
Intangible assets acquired 7.6                
Forage Division, Lely Group [Member] | Customer relationships                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired $ 3.0                
Weighted average useful life 5 years                
Forage Division, Lely Group [Member] | Technology                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired $ 3.0                
Weighted average useful life 12 years                
Forage Division, Lely Group [Member] | Trademarks                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired $ 1.6                
Weighted average useful life 10 years                
Precision Planting LLC [Member]                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Current assets   $ 59.5              
Property, plant and equipment   20.8              
Intangible assets   64.4              
Goodwill   67.2              
Total assets acquired   211.9              
Current liabilities   12.2              
Total liabilities assumed   12.2              
Net assets acquired   199.7              
Intangible assets acquired   64.4              
Precision Planting LLC [Member] | Customer relationships                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired   $ 21.4              
Weighted average useful life   14 years              
Precision Planting LLC [Member] | Technology                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired   $ 25.1              
Weighted average useful life   10 years              
Precision Planting LLC [Member] | Trademarks                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired   $ 17.9              
Weighted average useful life   20 years              
Cimbria Holdings Limited                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Current assets     $ 74.2            
Property, plant and equipment     21.9            
Intangible assets     128.9            
Goodwill     237.9            
Total assets acquired     462.9            
Current liabilities     63.8            
Deferred tax liabilities     38.5            
Long-term debt and other noncurrent liabilities     10.5            
Total liabilities assumed     112.8            
Net assets acquired     350.1            
Intangible assets acquired     128.9            
Cimbria Holdings Limited | Customer relationships                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired     $ 50.4            
Weighted average useful life     9 years            
Cimbria Holdings Limited | Technology                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired     $ 22.5            
Weighted average useful life     10 years            
Cimbria Holdings Limited | Trademarks                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired     $ 56.0            
Weighted average useful life     20 years            
Tecno Poultry Equipment                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired       $ 27.5          
Tecno Poultry Equipment | Customer relationships                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired       $ 15.7          
Weighted average useful life       10 years          
Tecno Poultry Equipment | Technology                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired       $ 7.9          
Weighted average useful life       10 years          
Tecno Poultry Equipment | Trademarks                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired       $ 3.9          
Weighted average useful life       10 years          
Farmer Automatic                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired         $ 9.6        
Farmer Automatic | Customer relationships                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired         $ 4.1        
Weighted average useful life         10 years        
Farmer Automatic | Technology                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired         $ 3.6        
Weighted average useful life         10 years        
Farmer Automatic | Trademarks                  
Finite-Lived Intangible Assets Acquired [Line Items]                  
Intangible assets acquired         $ 1.9        
Weighted average useful life         10 years