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Stockholders' Equity - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income | $ 24.4 | $ 27.1 | $ 79.1 | $ 77.3
Unrecognized estimated compensation costs | 139.8 |  | 139.8 |
Cost of Sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income | 2.2 | 2.5 | 6.9 | 7.1
Research and Development Expense |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income | 8.1 | 8.1 | 25.8 | 24.8
Selling General And Administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income | $ 14.1 | $ 16.5 | $ 46.4 | $ 45.4

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