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Short-Term Syndicated Facility (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Jun. 30, 2010	Jun. 30, 2009	Dec. 31, 2010 Uncollateralized Short term syndicated facility	Dec. 31, 2011 Uncollateralized Short term syndicated facility	Jun. 30, 2010 Uncollateralized Short term syndicated facility	Dec. 31, 2008 Uncollateralized Short term syndicated facility
Debt Instrument [Line Items]
Balance at beginning							$ 20.0	$ 20.0
Long and short-term loans raised	1,543.8	1,167.9	1,619.9	1,312.3
Long and short-term loans repaid							(20.0)
Balance at end								$ 20.0

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
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X

- Definition

Decrease for amounts repaid on the credit facility for the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 4

-Section 08

-Paragraph f



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

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