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Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Statement of Financial Position [Abstract] |  |
Preferred stock, par value | $ 0.001 | $ 0.001
Common stock, par value | $ 0.0005 | $ 0.0005
Treasury stock at cost, shares | 22.6 | 22.6

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