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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
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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

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599 + Details
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