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Incentive Compensation Plans Schedule of Stock-based Compensation Expense (Tables) | 12 Months Ended
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Dec. 31, 2018
Employee Service Share-based Compensation, Aggregate Disclosures [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,
| 2018 |  | 2017 |  | 2016
Stock options | $ | 0.0 |  |  | $ | 0.0 |  |  | $ | 0.2 |
Stock-settled awards | 24.7 |  |  | 20.5 |  |  | 16.0 |
Cash-settled awards | 0.6 |  |  | 1.0 |  |  | 0.9 |
Performance-based awards | 57.5 |  |  | 61.5 |  |  | 69.4 |
Employee stock purchase plan | 0.9 |  |  | 1.0 |  |  | 0.7 |
Other 1 | 0.9 |  |  | 0.5 |  |  | 0.8 |
Stock-based compensation expense | $ | 84.6 |  |  | $ | 84.5 |  |  | $ | 88.0 |
Tax benefit | $ | 20.4 |  |  | $ | 30.4 |  |  | $ | 32.1 |
1 | Represents charges recorded for severance expense related to stock-based compensation awards.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=109197908&loc=d3e5070-113901 + Details
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