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Incentive Compensation Plans Schedule of Nonvested Stock Activity (Tables) | 12 Months Ended
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Dec. 31, 2020
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 2020 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, 2020 |  | 4.7 |  |  | $ | 23.21 |  |  | 0.1 |  |  | $ | 23.20 |  |  | 5.6 |  |  | $ | 21.36 |
Granted |  | 2.3 |  |  | 20.70 |  |  | 0.0 |  |  | 21.02 |  |  | 2.4 |  |  | 18.67 |
Vested |  | (0.9) |  |  | 23.71 |  |  | 0.0 |  |  | 22.12 |  |  | (2.6) |  |  | 22.18 |
Forfeited |  | (0.4) |  |  | 22.55 |  |  | 0.0 |  |  | 23.14 |  |  | (0.6) |  |  | 21.12 |
Non-vested as of December 31, 2020 |  | 5.7 |  |  | $ | 22.18 |  |  | 0.1 |  |  | $ | 22.40 |  |  | 4.8 |  |  | $ | 19.61 |
Total unrecognized compensation expense remaining |  | $ | 48.5 |  |  |  |  | $ | 1.1 |  |  |  |  | $ | 33.9 |  |  |
Weighted-average years expected to be recognized over |  | 1.2 |  |  |  | 1.1 |  |  |  | 1.8 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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