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Share-Based Payments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Expense included in consolidated statements of income |  |  |  |
Share-based compensation expense | $ 55.0 | $ 41.4 | $ 104.0 | $ 87.6
Subtotal | 82.9 | 42.8 | 132.4 | 93.2
Capitalized share-based compensation costs | (2.8) | (2.8) | (6.1) | (6.2)
Share-based compensation expense included in total costs and expenses | 80.1 | 40.0 | 126.3 | 87.0
Income tax effect | (13.6) | (6.5) | (21.0) | (14.1)
Research and development |  |  |  |
Share-based Compensation Expense included in consolidated statements of income |  |  |  |
Share-based compensation expense | 28.1 | 17.6 | 49.8 | 39.5
Selling, general and administrative |  |  |  |
Share-based Compensation Expense included in consolidated statements of income |  |  |  |
Share-based compensation expense | 54.8 | 25.2 | 82.6 | 53.7
Total share-based compensation expense, net of tax |  |  |  |
Share-based Compensation Expense included in consolidated statements of income |  |  |  |
Share-based compensation expense | $ 66.5 | $ 33.5 | $ 105.3 | $ 72.9

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