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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Trade receivables, allowances $ 13.0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 9.4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property, plant and equipment, accumulated depreciation 835.9us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 833.4us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Intangible assets, accumulated amortization $ 124.0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 119.2us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Preferred stock, par value (in dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized (in shares) 12,000,000us-gaap_PreferredStockSharesAuthorized 12,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value (in dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (in shares) 600,000,000us-gaap_CommonStockSharesAuthorized 600,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares) 286,300,000us-gaap_CommonStockSharesIssued 286,300,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding (in shares) 231,100,000us-gaap_CommonStockSharesOutstanding 231,500,000us-gaap_CommonStockSharesOutstanding
Common stock, held in employee benefit trust (in shares) 200,000us-gaap_CommonStockSharesHeldInEmployeeTrustShares 200,000us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Treasury stock (in shares) 55,080,000us-gaap_TreasuryStockShares 54,626,000us-gaap_TreasuryStockShares