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Consolidated Balance Sheet Parenthetical (USD $) In Millions, except Per Share data	Jun. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheet Parenthetical [Abstract]
Accounts Receivable, Allowance	$ 1.0	$ 0.9
Common Stock Par Value	$ 0	$ 0
Common Stock Shares Authorized	80.0	80.0
Common Stock Shares Outstanding	36.5	35.8

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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