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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowances, accounts and notes receivable $ 7.5us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 7.9us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accumulated depreciation $ 655.3us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 654.1us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 25,000,000us-gaap_PreferredStockSharesAuthorized 25,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 87,170,197us-gaap_CommonStockSharesIssued 87,170,197us-gaap_CommonStockSharesIssued
Treasury stock, shares 42,181,306us-gaap_TreasuryStockShares 42,535,126us-gaap_TreasuryStockShares