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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Dec. 31, 2011
Maximum [Member]
Discrete tax benefit	$ 8.0
Minimum [Member]
Discrete tax benefit	$ 6.0

Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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