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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 1.1 $ 1.1
Common Stock, Par or Stated Value Per Share $ 1.00 $ 1.00
Common Stock, Shares Authorized 200,000,000 200,000,000
Common Stock, Shares, Issued 152,045,461 150,423,999
Preferred Stock, Par or Stated Value Per Share $ 1.00 $ 1.00
Preferred Stock, Shares Authorized 15,000,000 15,000,000
Preferred Stock, Shares Issued 0 0
Treasury Stock, Shares 10,920,546 11,889,468