Preference Shares (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Collateralized Preference shares
Debt Instrument [Line Items]
Opening balance	$ 2,361.2	$ 1,907.7	$ 91.4
Preference share dividend			1.3
Redemptions			(90.0)
Other			(2.3)
Translation			(0.4)
Closing balance	$ 2,361.2	$ 1,907.7

Payments of Dividends, Preference Shares

No definition available.

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- Definition

The cash outflow from non-convertible redeemable preference shares

+ References

No definition available.

+ Details

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- Definition

The increase (decrease) in cumulative translation adjustment before transfers included in determining net income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 23, 24, 25, 26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Details

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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- Definition

Other preferred stock dividends and adjustments, not otherwise defined in the taxonomy, that are necessary to adjust net income to obtain net income applicable to common stockholders.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section Q

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