Current Forecast of Benefit Payments which Reflect Expected Future Service (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2013	$ 37.1
2014	39.8
2015	40.4
2016	41.7
2017	43.9
2018-2022	248.4
Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2013	35.4
2014	37.1
2015	38.6
2016	40.2
2017	41.7
2018-2022	237.1
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2013	4.7
2014	4.9
2015	5.0
2016	5.1
2017	5.0
2018-2022	$ 22.2

Defined Benefit Plan, Expected Future Benefit Payments in Year Six Through Ten

No definition available.

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- Definition

Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

+ 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 (f)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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- Definition

Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

+ References

+ Details

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- Definition

Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

+ References

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- Definition

Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

+ References

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- Definition

Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

+ References

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