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Long-Term Incentive Employee Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Long-Term Incentive Employee Compensation Costs | LTIP costs are primarily recorded within general and administrative expenses, at fair value over the requisite service period (typically three years) on a straight-line basis and are reduced by forfeitures as they occur. These costs impacted our consolidated results of operations as follows:
| 2020 |  | 2019 |  | 2018
Equity-based awards | $ | 13.4 |  |  | $ | 15.7 |  |  | $ | 21.6 |
Liability-based awards | 0.8 |  |  | 2.8 |  |  | 1.5 |
Total share-based compensation expense | $ | 14.2 |  |  | $ | 18.5 |  |  | $ | 23.1 |
Rollforward of Outstanding Stock Options | A summary of activity related to our NQOs as of December 31, 2020, 2019 and 2018 is presented below.
| 2020 |  | 2019 |  | 2018
Stock Options | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price |  | Shares |  | Weighted Average Exercise Price
Outstanding – January 1 | 0.3 |  |  | $ | 33.55 |  |  | 0.7 |  |  | $ | 35.04 |  |  | 0.9 |  |  | $ | 34.07 |
Exercised | (0.1) |  |  | 35.37 |  |  | (0.4) |  |  | 36.08 |  |  | (0.2) |  |  | 30.52 |
Outstanding – December 31 | 0.2 |  |  | $ | 32.22 |  |  | 0.3 |  |  | $ | 33.55 |  |  | 0.7 |  |  | $ | 35.04 |
Options exercisable – December 31 | 0.2 |  |  | $ | 32.22 |  |  | 0.3 |  |  | $ | 33.55 |  |  | 0.5 |  |  | $ | 36.04 |
Share-Based Compensation Summary of Stock Options | The following table summarizes information about our outstanding and exercisable stock options at December 31, 2020.
Exercise Prices | Number of shares |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value |  |  |  |  |  |
$19.97 - $26.76 | 0.1 |  |  | 1.6 |  | $ | 3.7 |  |  |  |  |  |  |
$33.01 - $43.52 | 0.1 |  |  | 4.4 |  | 3.7 |  |  |  |  |  |  |
| 0.2 |  |  | 3.2 |  | $ | 7.4 |  |  |  |  |  |  |
Rollforward of Outstanding Restricted Stock | The table below provides a rollforward of outstanding RSUs and PSUs for each of the years ended December 31, 2020, 2019 and 2018.
| 2020 |  | 2019 |  | 2018
Restricted Stock and Performance Units | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding – January 1 | 1.0 |  |  | $ | 51.24 |  |  | 1.2 |  |  | $ | 42.94 |  |  | 1.2 |  |  | $ | 38.74 |
Granted | 0.3 |  |  | 61.13 |  |  | 0.3 |  |  | 60.91 |  |  | 0.4 |  |  | 54.79 |
Performance adjustment(a) | 0.1 |  |  | 57.88 |  |  | 0.1 |  |  | 44.87 |  |  | — |  |  | — |
Vested and issued | (0.5) |  |  | 44.86 |  |  | (0.6) |  |  | 38.03 |  |  | (0.3) |  |  | 41.09 |
Forfeited | (0.1) |  |  | 59.50 |  |  | — |  |  | — |  |  | (0.1) |  |  | 42.55 |
Outstanding – December 31 | 0.8 |  |  | $ | 59.25 |  |  | 1.0 |  |  | $ | 51.24 |  |  | 1.2 |  |  | $ | 42.94 |
Vested pending issuance | 0.2 |  |  | $ | 57.88 |  |  | 0.2 |  |  | $ | 44.87 |  |  | 0.2 |  |  | $ | 33.27 |
(a)Represents an adjustment for performance results achieved related to outstanding PSU shares that vested during the period and are pending issuance.
Number of Outstanding Equity Settled RSUs, Cash Settled RSUs and RSAs | The table below provides the number of the outstanding shares by award type as of December 31, 2020, 2019 and 2018. Cash-settled PSUs outstanding are not material.
| 2020 |  | 2019 |  | 2018
Equity-settled RSUs | 0.4 |  |  | 0.5 |  |  | 0.7 |
Cash-settled RSUs | — |  |  | 0.1 |  |  | 0.1 |
Equity-settled PSUs | 0.4 |  |  | 0.4 |  |  | 0.4 |

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