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Schedule of Unused Lines of Committed Credit Facilities (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Unused lines of credit | $ 1,009.5 | $ 1,016.9
Within one year |  |
Line of Credit Facility [Line Items] |  |
Unused lines of credit | 66.2 |
Later than one year and not later than two years |  |
Line of Credit Facility [Line Items] |  |
Unused lines of credit | 844.0 | 64.9
Later than two years and not later than three years |  |
Line of Credit Facility [Line Items] |  |
Unused lines of credit | $ 99.3 |
Later than three years and not later than five years |  |
Line of Credit Facility [Line Items] |  |
Unused lines of credit |  | $ 952.0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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