Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share)      
Common stock, shares issued 63.6us-gaap_CommonStockSharesIssued 63.5us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 62.9us-gaap_CommonStockSharesOutstanding 62.9us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 0.7us-gaap_TreasuryStockNumberOfSharesHeld 0.6us-gaap_TreasuryStockNumberOfSharesHeld