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Acquisitions Narrative (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Apr. 01, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business
Dec. 31, 2015
USD ($)
Business
Dec. 31, 2014
USD ($)
Business
Business Acquisition [Line Items]          
Payments to acquire businesses, net of cash acquired $ 0.0 $ 12.8 $ 190.1 $ 37.1 $ 289.0
Goodwill     $ 113.2 $ 21.2  
Acquisitions, 2016 [Member]          
Business Acquisition [Line Items]          
Number of businesses acquired | Business     3    
Payments to acquire businesses, net of cash acquired     $ 190.0    
Revenue of prior fiscal year     47.0    
Goodwill     $ 113.0    
Acquisitions, 2015 [Member]          
Business Acquisition [Line Items]          
Number of businesses acquired | Business       2  
Payments to acquire businesses, net of cash acquired       $ 37.0  
Revenue of prior fiscal year       18.0  
Goodwill       $ 21.0  
Acquisitions, 2014 [Member]          
Business Acquisition [Line Items]          
Number of businesses acquired | Business         6
Payments to acquire businesses, net of cash acquired         $ 289.0
Revenue of prior fiscal year         133.0
Goodwill         $ 151.0