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Reconciliation of Level Three Measurements (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | $ 63.8 | $ 59.4
Actual return on assets related to assets still held | 5.7 | 4.4
Purchases, sales and settlements | (5.0) |
Ending balance | 64.5 | 63.8
Group annuity/insurance contracts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 20.6 | 20.0
Actual return on assets related to assets still held | 0.6 | 0.6
Ending balance | 21.2 | 20.6
Commingled Funds | Multi-strategy hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 18.8 | 17.5
Actual return on assets related to assets still held | 1.7 | 1.3
Ending balance | 20.5 | 18.8
Commingled Funds | Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning balance | 24.4 | 21.9
Actual return on assets related to assets still held | 3.4 | 2.5
Purchases, sales and settlements | (5.0) |
Ending balance | $ 22.8 | $ 24.4

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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