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Goodwill and Other Intangible Assets, Net (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Goodwill and Other Intangible Assets, Net (Textual) [Abstract]
Amortization expense related to finite-lived intangible assets	$ 2.2	$ 2.1	$ 4.6	$ 4.2

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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