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Share-Based Compensation and Settlement of Share-Based Awards - Schedule of Share-Based Compensation Expense Recognized Under the Incentive Plan (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 17.2 | $ 7.5
Less: Income tax benefit | (3.6) | (1.6)
Total share-based compensation expense, net of tax | 13.6 | 5.9
Cost of revenue |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 4.9 | 1.8
Selling, general and administrative expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 12.3 | $ 5.7

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