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Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain Recognized in Income	$ 1.4
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1.5	1.0	1.4
Fair Value, Inputs, Level 3 [Member]
Marketable Securities		$ 1.6

The amount of gain recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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