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Intangible Assets (Schedule Of Amortization Expense And Impairment Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Intangible Assets [Abstract]
Amortization expense		$ 14.1	$ 14.0	$ 13.9
Intangible asset impairment	22.4			22.4
Total amortization expense and impairment charges		$ 14.1	$ 14.0	$ 36.3

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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