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Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total pre-tax stock-based compensation expense | $ 7.4 | $ 7.4 | $ 22.7 | $ 42.1
Cost of Revenues [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total pre-tax stock-based compensation expense | 1.2 | 0.8 | 3.1 | 1.9
Research and Development [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total pre-tax stock-based compensation expense | 1.0 | 1.0 | 3.0 | 2.8
Selling, General and Administrative [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total pre-tax stock-based compensation expense | 5.1 | 4.0 | 15.9 | 16.2
Acquisition and Integration Cost [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total pre-tax stock-based compensation expense | $ 0.1 | 1.2 | $ 0.7 | 20.8
Restructuring Related Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total pre-tax stock-based compensation expense |  | $ 0.4 |  | $ 0.4

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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