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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Allowances for doubtful accounts $ 2.5 $ 1.9
Inventory allowances $ 8.9 $ 8.9
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 29,554,500 29,554,500
Treasury stock, shares 6,005,647 6,222,076