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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary Of Share-Based Compensation Expense | Total share-based compensation expense related to the Company's stock options, RSUs, stock grant awards and the ESPP were recorded within the Consolidated Statements of Operations and Comprehensive Income as follows (in millions):
| Quarters Ended |  | Nine Months Ended
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Cost of revenue | $ | 1.7 |  |  | $ | 1.4 |  |  | $ | 5.1 |  |  | $ | 4.4 |
Research and development | 3.4 |  |  | 3.2 |  |  | 10.6 |  |  | 9.6 |
Selling and marketing | 3.3 |  |  | 2.8 |  |  | 10.5 |  |  | 8.8 |
General and administrative | 9.5 |  |  | 9.4 |  |  | 33.2 |  |  | 29.9 |
Share-based compensation expense before income taxes | $ | 17.9 |  |  | $ | 16.8 |  |  | $ | 59.4 |  |  | $ | 52.7 |
Related income tax benefits (1) | 3.8 |  |  | 5.9 |  |  | 12.5 |  |  | 18.4 |
Share-based compensation expense, net of taxes | $ | 14.1 |  |  | $ | 10.9 |  |  | $ | 46.9 |  |  | $ | 34.3 |
(1) | Tax benefit was calculated using the federal statutory rate of 21% and 35% for the quarters and nine months ended September 28, 2018 and September 29, 2017, respectively.
Summary Of Restricted Stock Units Transactions | A summary of the RSU transactions for the nine months ended September 28, 2018 is as follows (in millions, except per share data):
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value Per Share
Non-vested RSUs at December 31, 2017 |  | 9.8 |  |  | $ | 12.63 |
Granted |  | 3.0 |  |  | 24.30 |
Achieved |  | 0.7 |  |  | 15.26 |
Released |  | (3.9 | ) |  | 13.02 |
Forfeited |  | (0.5 | ) |  | 15.00 |
Non-vested RSUs at September 28, 2018 |  | 9.1 |  |  | 16.34 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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