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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income | The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Cost of revenues |  | $ | 1.2 |  |  | $ | 0.8 |  |  | $ | 3.1 |  |  | $ | 1.9 |
Research and development expense |  |  | 1.0 |  |  |  | 1.0 |  |  |  | 3.0 |  |  |  | 2.8 |
Selling, general and administrative expense |  |  | 5.1 |  |  |  | 4.0 |  |  |  | 15.9 |  |  |  | 16.2 |
Acquisition and integration related expense |  |  | 0.1 |  |  |  | 1.2 |  |  |  | 0.7 |  |  |  | 20.8 |
Restructuring related expense |  |  | — |  |  |  | 0.4 |  |  |  | — |  |  |  | 0.4 |
Total pre-tax stock-based compensation expense |  | $ | 7.4 |  |  | $ | 7.4 |  |  | $ | 22.7 |  |  | $ | 42.1 |
Summary of Activity for RSUs under 2014 Plan | The following table presents the activity for RSUs under the 2014 Plan:
|  | Nine Months Ended September 30, 2020 |
|  | Outstanding RSUs |  |  | Weighted Average Grant Date Fair Value |
RSUs – beginning of period |  |  | 1,102,534 |  |  | $ | 85.93 |
Accrued dividend shares |  |  | 535 |  |  | $ | 107.82 |
Granted |  |  | 305,610 |  |  | $ | 98.25 |
Vested |  |  | (732,416 | ) |  | $ | 85.32 |
Forfeited |  |  | (63,094 | ) |  | $ | 85.40 |
RSUs – end of period |  |  | 613,169 |  |  | $ | 92.87 |
Stock Appreciation Rights (SARs) [Member] |
Summary of Activity for SARs under 2014 Plan | The following table presents the activity for SARs under the 2014 Plan:
|  | Nine Months Ended September 30, 2020 |
|  | Outstanding SARs |  |  | Weighted Average Grant Date Fair Value |
SARs – beginning of period |  |  | 108,854 |  |  | $ | 29.05 |
Exercised |  |  | (49,492 | ) |  | $ | 27.42 |
Forfeited or expired |  |  | (1,400 | ) |  | $ | 22.39 |
SARs – end of period |  |  | 57,962 |  |  | $ | 30.61 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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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