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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 1.0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1.1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common Stock, Par or Stated Value Per Share $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 152,045,461us-gaap_CommonStockSharesIssued 152,045,461us-gaap_CommonStockSharesIssued
Preferred Stock, Par or Stated Value Per Share $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, Shares Authorized 15,000,000us-gaap_PreferredStockSharesAuthorized 15,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Treasury Stock, Shares 10,618,647us-gaap_TreasuryStockShares 10,920,546us-gaap_TreasuryStockShares