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Intangible assets and Goodwill (Narratives) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortizable Intangible Assets
Amortization of intangible assets	$ 24.7	$ 4.0	$ 1.3
Maximum
Amortizable Intangible Assets
Finite lived intangible assets useful life	40 years 0 months 0 days
Minimum
Amortizable Intangible Assets
Finite lived intangible assets useful life	1 year 0 months 0 days

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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