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Stock-Based Compensation - Common Shares Reserved for Issuance (Details) - shares shares in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Number of common shares reserved for issuance |  |
Shares available for granting under the 2002 plan (in shares) | 33.8 | 33.5
Options outstanding (in shares) | 2.1 | 3.8
Total shares reserved for issuance (in shares) | 35.9 | 37.3
Director Deferred Stock Ownership Plan |  |
Number of common shares reserved for issuance |  |
Total shares reserved for issuance (in shares) | 0.1 | 0.1

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- Definition Share based compensation arrangement by share based payment award, total number of shares reserved for issuance. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award number of shares reserved for issuance. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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