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Long-Term Debt - Maturity and Settlement of 1.00% Notes (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Shares issued to settle excess over principal for 1.00% Notes | $ 88,700,000 | $ 0 |  |
Share repurchased value | 321,000,000.0 | $ 65,400,000 | $ 139,000,000.0 | $ 315,300,000
Convertible Debt | 1.00% Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate |  | 1.00% |  |
Principal amount of debt | $ 690,000,000.0 |  |  |
Share repurchased value |  | $ 0 |  |
Exercise price, warrants (in dollars per share) |  | $ 25.96 |  |
Convertible Debt | 1.00% Notes | Embedded Derivative Financial Instruments |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of convertible shares (in shares) |  | 37,300,000 |  |

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