XML 58 R35.htm IDEA: XBRL DOCUMENT

Summary of Significant Accounting Policies (Intangible Assets - Useful Life) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets
Amortization of Intangible Assets	$ 4.4	$ 2.3	$ 1.8
Finite Lived Intangible Assets Amortization Years One Through Five	$ 4.7
Minimum
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life (in years)	10 years
Maximum
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life (in years)	20 years

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.

+ References+ Details