Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Allowance for accounts with partners $ 7.2 $ 6.0
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 63,167,438 63,135,772
Treasury stock, shares 5,491,038 5,257,638