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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares
shares in Millions
Sep. 30, 2015
Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]    
Preferred Stock, Shares Authorized 3.0 3.0
Preferred Stock, Shares Issued 0.0 0.0
Preferred Stock, Shares Outstanding 0.0 0.0
Common Stock, Par or Stated Value Per Share $ 0.25 $ 0.25
Common Stock, Shares Authorized 100.0 100.0
Common Stock, Shares, Issued 72.2 71.4
Common Stock, Shares, Outstanding 72.1 71.3
Treasury Stock, Shares 0.1 0.1