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Incentive Compensation Plans Stock-based Compensation, Grants in Period Weighted Average (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Stock Options Assumptions [Abstract] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] | Stock-based compensation awards expected to be settled in cash have been classified as liabilities in our Consolidated Balance Sheets as of December 31, 2017 and 2016.
|  | Years ended December 31,
|  | 2017 |  | 2016 |  | 2015
Stock-Settled Awards: |  |  |  |  |  |
Awards granted |  | 0.8 |  |  | 1.1 |  |  | 0.8 |
Weighted-average grant-date fair value (per award) |  | $ | 24.18 |  |  | $ | 21.87 |  |  | $ | 22.07 |
Total fair value of vested awards distributed |  | $ | 22.6 |  |  | $ | 17.5 |  |  | $ | 18.8 |
Cash-Settled Awards: |  |  |  |  |  |
Awards granted |  | 0.0 |  |  | 0.1 |  |  | 0.1 |
Weighted-average grant-date fair value (per award) |  | $ | 23.33 |  |  | $ | 22.54 |  |  | $ | 20.46 |
Total fair value of vested awards distributed |  | $ | 0.9 |  |  | $ | 0.7 |  |  | $ | 0.2 |
Performance-Based Awards: |  |  |  |  |  |
Awards granted |  | 4.8 |  |  | 3.3 |  |  | 2.9 |
Weighted-average grant-date fair value (per award) |  | $ | 20.06 |  |  | $ | 19.58 |  |  | $ | 20.88 |
Total fair value of vested awards distributed |  | $ | 112.4 |  |  | $ | 27.9 |  |  | $ | 18.7 |

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- Definition Summary of Stock Options Assumptions [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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