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Acquisitions (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 17, 2015
Jun. 30, 2015
Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]      
Purchase of businesses, net of cash acquired   $ 18.6 $ 0.1
Finite-lived intangible assets acquired   9.6  
Goodwill acquired in acquisition   10.7  
Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired   $ 4.1  
Farmer Automatic [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Purchase of businesses, net of cash acquired $ 18.6    
Cash acquired from acquisition 0.1    
Finite-lived intangible assets acquired 9.6    
Goodwill acquired in acquisition 10.7    
Farmer Automatic [Member] | Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 4.1    
Finite-lived intangible assets acquired, weighted average useful life 10 years    
Farmer Automatic [Member] | Technology-Based Intangible Assets [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 3.6    
Finite-lived intangible assets acquired, weighted average useful life 10 years    
Farmer Automatic [Member] | Trademarks [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets acquired $ 1.9    
Finite-lived intangible assets acquired, weighted average useful life 10 years