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Convertible Debt (Tables) | 9 Months Ended
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Sep. 30, 2021
0 Percent Convertible Senior Notes [Member] |
Convertible Notes [Abstract] |
Convertible Notes | At September 30, 2021, we had the following 0% Notes outstanding (amounts in millions except interest rate and price per share data):
|  | 0% Notes |
Outstanding principal balance |  | $ | 632.5 |
Unamortized debt issuance costs |  | $ | 14.2 |
Maturity date |  | April 2026 |
Interest rate |  | 0 percent |
Effective interest rate |  | 0.5 percent |
Conversion price per share |  | $ | 57.84 |
Effective conversion price per share with call spread |  | $ | 76.39 |
Total shares of common stock subject to conversion |  |  | 10.9 |
0.125 Percent Convertible Senior Notes [Member] |
Convertible Notes [Abstract] |
Convertible Notes | At September 30, 2021, we had the following 0.125% Notes outstanding with interest payable semi-annually (amounts in millions except interest rate and price per share data):
|  | 0.125% Notes |
Outstanding principal balance |  | $ | 548.8 |
Unamortized debt issuance costs |  | $ | 7.1 |
Maturity date |  | December 2024 |
Interest rate |  | 0.125 percent |
Effective interest rate |  | 0.5 percent |
Conversion price per share |  | $ | 83.28 |
Effective conversion price per share with call spread |  | $ | 123.38 |
Total shares of common stock subject to conversion |  |  | 6.6 |
1 Percent Convertible Senior Notes [Member] |
Convertible Notes [Abstract] |
Convertible Notes | At September 30, 2021, we had the following 1% Notes outstanding with interest payable semi-annually (amounts in millions except interest rate and price per share data):
|  | 1% Notes |
Outstanding principal balance |  | $ | 62.0 |
Unamortized debt issuance costs |  | $ | 0.03 |
Maturity date |  | November 2021 |
Interest rate |  | 1 percent |
Effective interest rate |  | 1.4 percent |
Conversion price per share |  | $ | 66.81 |
Total shares of common stock subject to conversion |  |  | 0.9 |

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