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Description of Business (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 segment	Mar. 31, 2011
Description of Business
Number of reportable segments	2
Prior Year Financial Statement Reclassification
Amortization of acquisition-related intangible assets		$ 3.3

The amount of expense recognized in the current period that reflects the allocation of capitalized costs associated with acquisition of business. 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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