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Intangible Assets and Goodwill - Intangible Assets Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets held for sale	$ 1.7
Contingent consideration payments	0.5	0.7
Amortization expense	$ 3.6	$ 7.2

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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