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Incentive Compensation Plans Schedule of Nonvested Stock Activity (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Stock Options Assumptions [Abstract] |
Schedule of Nonvested Share Activity [Table Text Block] | A summary of the activity of our non-vested stock-settled awards, cash-settled awards and performance-based awards during 2017 is presented below (performance-based awards are shown at 100% of the shares originally granted).
|  | Stock-Settled Awards |  | Cash-Settled Awards |  | Performance-Based Awards
|  | Awards |  | Weighted- Average Grant-Date Fair Value (per award) |  | Awards |  | Weighted- Average Grant-Date Fair Value (per award) |  | Awards |  | Weighted- Average Grant-Date Fair Value (per award)
Non-vested as of January 1, 2017 |  | 2.3 |  |  | $ | 20.84 |  |  | 0.1 |  |  | $ | 20.49 |  |  | 8.5 |  |  | $ | 19.16 |
Granted |  | 0.8 |  |  | 24.18 |  |  | 0.0 |  |  | 23.33 |  |  | 4.8 |  |  | 20.06 |
Vested |  | (1.0 | ) |  | 19.49 |  |  | 0.0 |  |  | 19.27 |  |  | (4.6 | ) |  | 16.64 |
Forfeited |  | 0.0 |  |  | 21.86 |  |  | 0.0 |  |  | 20.50 |  |  | (0.4 | ) |  | 20.00 |
Non-vested as of December 31, 2017 |  | 2.1 |  |  | $ | 22.78 |  |  | 0.1 |  |  | $ | 22.52 |  |  | 8.3 |  |  | $ | 21.05 |
Total unrecognized compensation expense remaining |  | $ | 24.1 |  |  |  |  | $ | 1.0 |  |  |  |  | $ | 71.9 |  |  |
Weighted-average years expected to be recognized over |  | 1.0 |  |  |  |  | 1.0 |  |  |  |  | 1.7 |  |  |

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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 changes in outstanding nonvested shares. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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