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Financial Data by Segment and Geographic Area - Schedule of Long Lived Assets by Country (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Long Lived Assets Geographic [Line Items]    
Total long-lived assets $ 2,269.5 $ 2,241.3
United States [Member]    
Long Lived Assets Geographic [Line Items]    
Total long-lived assets 1,786.1 1,788.3
Canada [Member]    
Long Lived Assets Geographic [Line Items]    
Total long-lived assets 480.6 450.6
Other Country [Member]    
Long Lived Assets Geographic [Line Items]    
Total long-lived assets $ 2.8 $ 2.4