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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, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	$ 257.0	$ 191.8
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	249.1	184.3	186.7
Pension [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	249.1	184.3
Pension [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset			81.5
Pension [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	86.9	60.0
Pension [Member] | Domestic [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	86.9	60.0
Pension [Member] | International equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	46.0	33.5
Pension [Member] | International equities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	46.0	33.5
Pension [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	26.2	16.4
Pension [Member] | Emerging Markets [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	26.2	16.4
Pension [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	86.1	62.8
Pension [Member] | Fixed income [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	86.1	62.8
Pension [Member] | Cash and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	3.9	11.6
Pension [Member] | Cash and other [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	3.9	11.6
Others Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	7.9	7.5	7.8
Others Benefits [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	7.9	7.5
Others Benefits [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	7.9	7.5
Others Benefits [Member] | Fixed income [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan asset	$ 7.9	$ 7.5

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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 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 49

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(iv)(b)(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: 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=21915506&loc=d3e1928-114920

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