Derivative Financial Instruments - Remaining Contract Maturity of Fair Value of OTC Derivative Assets and Liabilities (Parenthetical) (Detail) (Successor [Member], USD $) In Millions, unless otherwise specified	Nov. 30, 2013
Successor [Member]
Remaining Contract Maturity Of Fair Value Of Over Counter Derivative Assets And Liabilities [Line Items]
Exchange traded derivative assets	$ 43.1
Cash collateral received	208.6
Exchange traded derivative liabilities, with fair value	18.2
Cash collateral pledged	$ 307.7