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Postretirement Benefit Plans - Fair Value of Plan Assets Held by Our Postretirement Benefits Plans (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | $ 278.0 | $ 257.0 |
Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 268.8 | 249.1 | 184.3
Pension [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 268.8 | 249.1 |
Pension [Member] | Level 2 [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 98.2 | 86.9 |
Pension [Member] | Level 2 [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 56.6 | 46.0 |
Pension [Member] | Level 2 [Member] | Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 25.5 | 26.2 |
Pension [Member] | Level 2 [Member] | Fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 85.0 | 86.1 |
Pension [Member] | Level 2 [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 3.5 | 3.9 |
Pension [Member] | Total [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 268.8 | 249.1 |
Pension [Member] | Total [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 98.2 | 86.9 |
Pension [Member] | Total [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 56.6 | 46.0 |
Pension [Member] | Total [Member] | Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 25.5 | 26.2 |
Pension [Member] | Total [Member] | Fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 85.0 | 86.1 |
Pension [Member] | Total [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 3.5 | 3.9 |
Others Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 9.2 | 7.9 | 7.5
Others Benefits [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 9.2 | 7.9 |
Others Benefits [Member] | Level 3 [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Others Benefits [Member] | Level 3 [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Others Benefits [Member] | Level 3 [Member] | Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Others Benefits [Member] | Level 3 [Member] | Fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 9.2 | 7.9 |
Others Benefits [Member] | Level 3 [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Others Benefits [Member] | Total [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 9.2 | 7.9 |
Others Benefits [Member] | Total [Member] | U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Others Benefits [Member] | Total [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Others Benefits [Member] | Total [Member] | Emerging Markets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 0 | 0 |
Others Benefits [Member] | Total [Member] | Fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | 9.2 | 7.9 |
Others Benefits [Member] | Total [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan asset | $ 0 | $ 0 |

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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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