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Other Expenses - Summary of Other Expenses (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Apr. 16, 2012 $1 billion syndicated revolving credit facility	Dec. 31, 2013 $1 billion syndicated revolving credit facility Collateralized	Jun. 20, 2011 $1 billion syndicated revolving credit facility Collateralized	Dec. 31, 2013 $500 million syndicated revolving credit facility Collateralized	Apr. 17, 2012 $500 million syndicated revolving credit facility Collateralized
Components of Other Income (Expense) [Line Items]
Long-term revolving credit facility	$ 1,000.0	$ 1,000.0	$ 1,000.0	$ 500.0	$ 500.0

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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