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Other assets - Components of Net Distributions from LPC (Detail) (LPC [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
LPC [Member]
Summary of Investment Holdings [Line Items]
Distributions from LPC	$ 79.5	$ 29.7	$ 26.1
Contributions to LPC	(100.2)	(25.9)	(23.7)
Net distributions (contributions)	$ (20.7)	$ 3.8	$ 2.4

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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