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Securities Financing Including Redeemable Preferred Stocks- Summary of Redeemable Preferred Stock (Paranthetical) (Detail) $ in Millions | Dec. 31, 2015 USD ($)
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Series E Redeemable Preferred Stock |
Class Of Stock [Line Items] |
Redeemable preferred stock issuance costs | $ 10.6
Series F Redeemable Preferred Stock [Member] |
Class Of Stock [Line Items] |
Redeemable preferred stock issuance costs | $ 10.6

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