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Incentive Compensation Plans Schedule of Stock-based Compensation Expense (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Additional Disclosure [Abstract] |
Schedule of Stock-based Compensation Expense | The amounts of stock-based compensation expense as reflected in salaries and related expenses in our Consolidated Statements of Operations, and the related tax benefit, are listed below.
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
Stock-settled awards | $ | 38.4 |  |  | $ | 33.5 |  |  | $ | 24.7 |
Cash-settled awards | 1.0 |  |  | 0.8 |  |  | 0.6 |
Performance-based awards | 28.6 |  |  | 46.7 |  |  | 57.5 |
Employee stock purchase plan | 1.4 |  |  | 1.1 |  |  | 0.9 |
Other 1 | 1.7 |  |  | 0.6 |  |  | 0.9 |
Stock-based compensation expense | $ | 71.1 |  |  | $ | 82.7 |  |  | $ | 84.6 |
Tax benefit | $ | 17.3 |  |  | $ | 20.0 |  |  | $ | 20.4 |
1 Represents charges recorded for severance expense related to stock-based compensation awards.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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