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Summary of Changes in Fair Value of Plans' Level 3 Assets (Detail) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 U.S. Plans | Dec. 31, 2012 U.S. Plans | Dec. 31, 2011 U.S. Plans | Dec. 31, 2013 Other Postretirement Benefit Plans | Dec. 31, 2012 Other Postretirement Benefit Plans | Dec. 31, 2011 Other Postretirement Benefit Plans | Dec. 31, 2013 International Plans | Dec. 31, 2012 International Plans | Dec. 31, 2011 International Plans | Dec. 31, 2013 Fair Value, Inputs, Level 3 U.S. Plans | Dec. 31, 2012 Fair Value, Inputs, Level 3 U.S. Plans | Dec. 31, 2013 Fair Value, Inputs, Level 3 U.S. Plans Real Estate | Dec. 31, 2012 Fair Value, Inputs, Level 3 U.S. Plans Real Estate | Dec. 31, 2013 Fair Value, Inputs, Level 3 U.S. Plans Private Equity | Dec. 31, 2012 Fair Value, Inputs, Level 3 U.S. Plans Private Equity | Dec. 31, 2013 Fair Value, Inputs, Level 3 U.S. Plans Insurance Contracts | Dec. 31, 2012 Fair Value, Inputs, Level 3 U.S. Plans Insurance Contracts | Dec. 31, 2013 Fair Value, Inputs, Level 3 Other Postretirement Benefit Plans Insurance Contracts | Dec. 31, 2012 Fair Value, Inputs, Level 3 Other Postretirement Benefit Plans Insurance Contracts | Dec. 31, 2013 Fair Value, Inputs, Level 3 International Plans | Dec. 31, 2012 Fair Value, Inputs, Level 3 International Plans | Dec. 31, 2013 Fair Value, Inputs, Level 3 International Plans Real Estate | Dec. 31, 2012 Fair Value, Inputs, Level 3 International Plans Real Estate | Dec. 31, 2013 Fair Value, Inputs, Level 3 International Plans Insurance Contracts | Dec. 31, 2012 Fair Value, Inputs, Level 3 International Plans Insurance Contracts | Dec. 31, 2013 Fair Value, Inputs, Level 3 International Plans Commingled Funds | Dec. 31, 2012 Fair Value, Inputs, Level 3 International Plans Commingled Funds
Changes In Level 3 Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ 4,048.0 | $ 3,786.7 | $ 3,558.7 | $ 9.2 | $ 9.7 | $ 9.3 | $ 2,681.8 | $ 2,399.2 | $ 2,115.8 | $ 146.5 | $ 158.9 | $ 34.8 | $ 33.7 | $ 20.8 | $ 45.6 | $ 90.9 | $ 79.6 | $ 7.9 | $ 7.5 | $ 235.9 | $ 185.0 | $ 31.1 | $ 29.0 | $ 146.7 | $ 145.5 | $ 58.1 | $ 10.5
Realized gains (losses) |  |  |  |  |  |  |  |  |  | (17.0) | 7.6 | 0.5 | 0.3 | (17.5) | 7.3 |  |  | (0.2) | 0.4 | 0.4 |  |  |  |  |  | 0.4 |
Purchases or acquisitions |  |  |  |  |  |  |  |  |  |  | 7.9 |  |  |  | 0.3 |  | 7.6 | 0.2 | 0.3 | 16.1 | 47.6 | 9.5 | 0.4 | 6.6 | 5.5 |  | 41.7
Sales or dispositions |  |  |  |  |  |  |  |  |  | (14.9) | (27.9) | (2.4) | (1.2) | (5.8) | (26.7) | (6.7) |  | (0.4) | (0.3) | (25.0) | (12.3) |  |  | (12.7) | (12.1) | (12.3) | (0.2)
Currency and unrealized gains (losses) relating to instruments still held at end of year |  |  |  |  |  |  |  |  |  | 16.1 |  | 1.8 | 2.0 | 19.0 | (5.7) | (4.7) | 3.7 |  |  | 16.9 | 15.6 | 2.2 | 1.7 | 10.7 | 7.8 | 4.0 | 6.1
Fair value of plan assets at end of year | $ 4,048.0 | $ 3,786.7 | $ 3,558.7 | $ 9.2 | $ 9.7 | $ 9.3 | $ 2,681.8 | $ 2,399.2 | $ 2,115.8 | $ 130.7 | $ 146.5 | $ 34.7 | $ 34.8 | $ 16.5 | $ 20.8 | $ 79.5 | $ 90.9 | $ 7.5 | $ 7.9 | $ 244.3 | $ 235.9 | $ 42.8 | $ 31.1 | $ 151.3 | $ 146.7 | $ 50.2 | $ 58.1

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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition The amount of increase in the plan assets attributed to a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(6) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of decrease in the plan assets attributed to the sale, liquidation, spin-off or other divestiture of a corporate division or subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(7) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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