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Goodwill and Intangible Assets - Schedule of Long Lived Assets by Country (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Long Lived Assets Geographic [Line Items]    
Total long-lived assets $ 2,391.1 $ 2,311.7
United States [Member]    
Long Lived Assets Geographic [Line Items]    
Total long-lived assets 1,796.9 1,800.5
Canada [Member]    
Long Lived Assets Geographic [Line Items]    
Total long-lived assets 488.6 481.2
Other [Member]    
Long Lived Assets Geographic [Line Items]    
Total long-lived assets $ 105.6 $ 30.0