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Incentive Compensation Plans Schedule of Stock Options Activity (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Stock Options Assumptions [Abstract] |
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes our stock option activity during 2017.
|  | Options |  | Weighted- Average Exercise Price (per option) |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Stock options outstanding as of January 1, 2017 |  | 4.8 |  |  | $ | 9.83 |  |  |  |  |
Exercised |  | (1.1 | ) |  | 11.15 |  |  |  |  |
Stock options outstanding as of December 31, 2017 |  | 3.7 |  |  | $ | 9.44 |  |  | 2.6 |  | $ | 39.2 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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