Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheets [Abstract]    
Allowance for accounts with partners $ 6.0 $ 4.4
Common stock, par value $ 0.10 $ 0.10
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 63,135,772 62,376,563
Treasury stock, shares 5,257,638 5,257,638