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Sale of NAC Subsidiary (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Mar. 15, 2013	Dec. 31, 2012
Discontinued Operation, Additional Disclosures [Abstract]
Goodwill	$ 0		$ 0		$ 6.8	$ 6.8
Proceeds from sale of subsidiary	3.3		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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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.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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