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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Receivables, net of allowance for doubtful accounts $ 27.2 $ 25.9
Preferred stock, par value per share $ 0.10 $ 0.10
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares issued 0 0
Common stock, par value per share $ 0.10 $ 0.10
Common stock, shares authorized 400,000,000 400,000,000
Common stock, shares issued 205,278,598 204,660,621
Common stock, shares outstanding 195,824,192 194,557,669
Common stock reserved for issuance related to Settlement agreement, par value per share $ 0.10 $ 0.10
Common stock reserved for issuance related to Settlement agreement, shares 18,000,000 18,000,000
Common stock in treasury, shares 9,454,406 10,102,952