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Acquisitions (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2016
USD ($)
Mar. 31, 2016
USD ($)
item
Mar. 31, 2015
USD ($)
item
Dec. 31, 2015
USD ($)
Acquisitions        
Number of acquisitions | item   2    
Environmental Air Systems        
Acquisitions        
Total purchase price $ 47.0      
Interest acquired (as a percent) 40.00%      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets        
Purchase price paid in cash $ 42.0      
Shoffner        
Acquisitions        
Total purchase price   $ 19.5    
Interest acquired (as a percent)   100.00%    
Amount allocated to goodwill and identifiable intangible assets for acquisitions   $ 13.5    
Revenue in consolidated results   14.5    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets        
Purchase price paid in cash   $ 15.5    
Other Acquisitions        
Acquisitions        
Total purchase price       $ 6.7
Number of acquisitions | item     2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets        
Cash and cash equivalents     $ 0.8