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Variable Interest Entities (Details) (Signal Peak, USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2011
Signal Peak
Variable Interest Entity [Line Items]
Fair value of retained noncontrolling investment	$ 400.0
Less: Carrying value of retained interest	21.4
Gain on retained interest	$ 378.6

In connection with deconsolidation of a subsidiary or derecognition of a group of assets, the portion of any gain (loss) recognized by the parent, during the period, which is related to the remeasurement of any retained investment in the former subsidiary or group of assets to its fair value.

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