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Condensed Consolidated Balance Sheet Parenthetical (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Series A Junior Participating Preferred Stock, par value per share $ 0.01 $ 0.01
Series A Junior participating preferred stock, authorized 0.1 0.1
Series A junior participating preferred stock, outstanding 0 0
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 10.0 10.0
Preferred Stock, Shares Outstanding 0 0
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 150.0 150.0
Common Stock, Shares, Issued 79.3 74.3
Series Common Stock, par value per share $ 0.01 $ 0.01
Series common stock, authorized 40.0 40.0
Series common stock, outstanding 0 0
Treasury Stock, Shares 5.5 5.5