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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.6	$ 2.4
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized (shares)	90,000,000	90,000,000
Common stock, shares issued (shares)	63,700,000	63,400,000
Treasury stock, shares (shares)	1,000,000	1,000,000

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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