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Goodwill and Intangible Assets (Details) (Commercial, USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Commercial
Goodwill
Goodwill totaled	$ 25.5	$ 25.5

Change in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment, if any, goodwill written off related to the sale of a business or other adjustments to goodwill.

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