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Consolidated Statements of Stockholder's Equity (Parenthetical) - shares shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders' equity [Roll Forward] |  |  |
Employee stock options (in shares) | 0.7 | 0.8 | 2.2

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- Definition Number of share options (or share units) exercised during the current period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration