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Goodwill (Details) (ATM Group [Member], Broker-Dealer [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
ATM Group [Member] \| Broker-Dealer [Member]
Goodwill [Line Items]
Goodwill recognized in period	$ 6.2

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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