Employee Benefit Plans - Schedule of Defined Benefit Plan Expected Future Payments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Defined Benefit Pension Plans
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2014	$ 29.2
2015	29.2
2016	29.0
2017	29.8
2018	30.4
Next 5 years	168.3
OPEB
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2014	1.5
2015	1.4
2016	1.3
2017	1.2
2018	1.1
Next 5 years	$ 4.9

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

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=28361610&loc=d3e1928-114920

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

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

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

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

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

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