Reconciliation of Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Plan amendments and other	$ 81.5
Employer contributions		148.7	54.6	48.8
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year		3,923.6	3,583.1
Service cost		5.9	86.6	80.4
Interest cost		189.2	192.0	184.0
Plan participants' contributions		1.2	1.2
Actuarial loss (gain)		411.2	306.4
Plan amendments and other		2.6	(0.5)
Curtailments and settlements		(6.5)	(61.6)
Foreign currency translation		17.5	(5.4)
Benefits paid		(175.9)	(178.2)
Benefit obligation at end of year		4,368.8	3,923.6	3,583.1
Fair value of plan assets at beginning of year		2,849.6	3,029.6
Actual return on assets		389.9	(44.4)
Settlements		(3.7)
Employer contributions		140.7	44.7
Plan participants' contributions		1.2	1.2
Foreign currency translation		13.5	(3.3)
Benefits paid		(175.9)	(178.2)
Fair value of plan assets at end of year		3,215.3	2,849.6	3,029.6
Funded status at end of year		(1,153.5)	(1,074.0)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year		403.1	490.3
Service cost		6.6	8.2	12.2
Interest cost		18.4	22.7	28.4
Plan participants' contributions		14.4	17.8
Medicare reimbursements		3.3	3.3
Actuarial loss (gain)		27.6	(22.5)
Plan amendments and other		0.5	(72.4)
Foreign currency translation		1.1	(0.8)
Benefits paid		(44.8)	(43.5)
Benefit obligation at end of year		430.2	403.1	490.3
Fair value of plan assets at beginning of year		174.7	191.9
Actual return on assets		21.0	(4.7)
Employer contributions		8.0	13.2
Medicare reimbursements		3.3
Plan participants' contributions		14.4	17.8
Other		10.2
Foreign currency translation		0.3
Benefits paid		(44.8)	(43.5)
Fair value of plan assets at end of year		187.1	174.7	191.9
Funded status at end of year		$ (243.1)	$ (228.4)

Defined Benefit Plan, Curtailments and Settlements, Benefit Obligation

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Defined Benefit Plan Medicare Reimbursement

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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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.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 15

-Paragraph 6

-Subparagraph (a)(1)

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- Definition

The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 25

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