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Sale of NAC Subsidiary (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Mar. 15, 2013 | Dec. 31, 2012
Discontinued Operation, Additional Disclosures [Abstract] |  |  |  |  |
Goodwill |  | $ 0 |  | $ 6.8 | $ 6.8
Proceeds from sale of subsidiary |  | 43.2 | 0 |  |
Gain on sale of subsidiary | 35.6 | 35.6 | 0 |  |
Net assets and liabilities of subsidiary |  |  |  | 5.5 |
Transaction costs for sale of subsidiary |  |  |  | $ 2.1 |

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- Definition Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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