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Consolidated Balance Sheets Parenthetical (Parentheticals) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Series A Preferred Stock [Member]
    
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 0.1 0.1
Preferred Stock, Shares Outstanding 0 0
Preferred Stock [Member]
    
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 [Member]
    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 150.0 150.0
Common Stock, Shares, Issued 80.9 79.3
Treasury Stock, Shares 6.0 5.5
Series Common Stock [Member]
    
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 40.0 40.0
Common Stock, Shares, Outstanding 0 0