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(8) Subsequent Event (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	Aug. 17, 2012
Dividends Payable, Amount Per Share (in Dollars per share)	$ 0.50
Dividends Payable, Current	$ 14.6

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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