Other Post-Employment Benefits and Other Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of net periodic benefit cost:
Service cost	$ 10.0us-gaap_DefinedBenefitPlanServiceCost	$ 12.3us-gaap_DefinedBenefitPlanServiceCost	$ 16.1us-gaap_DefinedBenefitPlanServiceCost
Interest cost	48.0us-gaap_DefinedBenefitPlanInterestCost	43.4us-gaap_DefinedBenefitPlanInterestCost	46.6us-gaap_DefinedBenefitPlanInterestCost
Amortization of prior service credit	0.1	0.4	0.3
Other Post-Employment Benefits and Other Employee Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	0.8	0.9	1.0
Interest cost	3.2	3.0	3.3
Amortization of net loss	0.1	0.4
Amortization of prior service credit	(0.7)	(0.7)	(0.9)
Net periodic benefit cost	$ 3.4	$ 3.6	$ 3.4

Net periodic benefit cost.

No definition available.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

+ Details

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

+ Details

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- Definition

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.

+ References

+ Details

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- Details

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- Definition

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.

+ 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 (h)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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- Details

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