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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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- Details
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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
Period Type: | instant

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- 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 + Details
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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. + Details
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