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Consolidated Balance Sheets (Parenthetical)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Common stock, shares issued 52.6us-gaap_CommonStockSharesIssued 52.4us-gaap_CommonStockSharesIssued
Treasury stock, shares 2.7us-gaap_TreasuryStockShares 2.7us-gaap_TreasuryStockShares