Reconciliation of Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Plan amendments and other	$ (404.0)
Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	3,952.7	4,368.8
Service cost	2.2	2.2	5.9
Interest cost	194.5	178.2	189.2
Plan participants' contributions	0.5	0.5
Medicare reimbursements
Actuarial loss (gain)	652.3	(404.2)
Plan amendments and other		(0.1)
Curtailments and settlements	(317.7)	(9.0)
Foreign currency translation	(35.3)	(8.5)
Benefits paid	(173.4)	(175.2)
Acquisitions	176.4
Benefit obligation at end of year	4,452.2	3,952.7	4,368.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	3,707.3	3,215.3
Actual return on assets	455.4	658.0
Settlements	(317.7)	(8.7)
Employer contributions	30.9	21.6
Medicare reimbursements
Plan participants' contributions	0.5	0.5
Acquisitions	170.2
Foreign currency translation	(31.4)	(4.2)
Benefits paid	(173.4)	(175.2)
Fair value of plan assets at end of year	3,841.8	3,707.3	3,215.3
Funded status at end of year	(610.4)	(245.4)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	382.3	430.2
Service cost	4.6	7.3	6.6
Interest cost	16.8	16.2	18.4
Plan participants' contributions	13.8	14.5
Medicare reimbursements	4.2	2.7
Actuarial loss (gain)	43.1	(13.6)
Plan amendments and other	(7.4)	(30.6)
Curtailments and settlements
Foreign currency translation	(4.2)	(2.9)
Benefits paid	(34.6)	(41.5)
Acquisitions	6.0
Benefit obligation at end of year	424.6	382.3	430.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	206.8	187.1
Actual return on assets	11.5	35.6
Settlements
Employer contributions	11.0	8.0
Medicare reimbursements	4.2	2.7
Plan participants' contributions	13.8	14.5
Acquisitions
Foreign currency translation	(0.1)	0.4
Benefits paid	(34.6)	(41.5)
Fair value of plan assets at end of year	212.6	206.8	187.1
Funded status at end of year	$ (212.0)	$ (175.5)

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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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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-Glossary Projected Benefit Obligation

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-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

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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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- Definition

The amount of increase in the benefit obligation attributed to business combinations.

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The amount of increase in the plan assets attributed to a business combination.

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The increase in the fair value of plan assets from contributions made by the employer.

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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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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 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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