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Assets, Depreciation And Capital Expenditure By Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total Assets $ 3,197.3 $ 2,891.0 $ 2,629.2
Depreciation and amortization 70.1 65.1 63.0
Capital expenditures 94.2 80.7 72.7
Corporate      
Segment Reporting Information [Line Items]      
Total Assets 863.4 790.8 703.9
Depreciation and amortization 1.2 1.2 1.3
Capital expenditures 0.5 0.5 0.8
North America | Operating Segments      
Segment Reporting Information [Line Items]      
Total Assets 1,592.5 1,515.9 1,381.1
Depreciation and amortization 45.1 42.9 41.9
Capital expenditures 38.5 45.9 43.5
Rest of World | Operating Segments      
Segment Reporting Information [Line Items]      
Total Assets 741.4 584.3 544.2
Depreciation and amortization 23.8 21.0 19.8
Capital expenditures $ 55.2 $ 34.3 $ 28.4