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Stockholders' Equity - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income (loss) | $ 29.7 | $ 25.6 | $ 54.7 | $ 50.2
Unrecognized estimated compensation costs | 161.7 |  | 161.7 |
Cost of Sales |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income (loss) | 2.4 | 2.4 | 4.7 | 4.6
Research and Development Expense |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income (loss) | 9.2 | 8.2 | 17.7 | 16.7
Selling General And Administrative |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total share-based compensation expense included in net income (loss) | $ 18.1 | $ 15.0 | $ 32.3 | $ 28.9

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