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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 0.9 $ 1.0
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 153,147,190 152,979,708
Common Stock, Shares, Outstanding 144,895,593 143,169,626
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 8,462,949 9,041,733