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Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Other Intangible Assets [Abstract]
Goodwill impairment loss		$ 1.8	$ 0.8
Accumulated impairment loss		$ 6.1
Market royalty rate, used to calculate fair value of indefinite-lived intangible assets	6.00%
Discount rate, used to calculate fair value of indefinite-lived intangible assets	7.60%

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Market royality rate used as a fair value input.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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