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Assets, Depreciation And Capital Expenditure By Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
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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

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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