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Financial Instruments and Fair Value Measurements - Equity Investment in Entasis (Details) - Entasis $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2021 USD ($) director $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) director $ / shares | Jun. 30, 2020 USD ($) $ / shares | Dec. 31, 2020 USD ($)
Equity Investment |  |  |  |  |  |
Number of investee's board members which may be designated by the Company | director |  |  |  | 2 |  |
Number of Investee's Board members currently representing the Company | director | 0 |  |  | 0 |  |
Number of the Investee's Board members | director | 6 |  |  | 6 |  |
Number of tranches | 2 |  |  |  |  |
Equity investment ownership percentage | 60.60% |  |  | 60.60% |  | 51.00%
Unrealized gain from fair value changes in equity investments | $ 44.7 |  | $ 33.3 | $ 33.2 | $ 33.3 |
Common stock and warrants |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Payments to acquire equity securities | 20.0 | $ 12.5 | $ 35.0 |  |  |
Fair value of equity securities | $ 131.3 |  |  | 131.3 |  | $ 78.0
Common stock |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Number of shares purchased under the securities purchase agreement | shares | 10,000,000 | 4,672,897 | 14,000,000 |  |  |
Fair value of equity securities | $ 76.6 |  |  | 76.6 |  | 46.1
Warrants |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Number of warrants purchased under the securities purchase agreement | shares | 10,000,000 | 4,672,897 | 14,000,000 |  |  |
Fair value of equity securities | $ 54.7 |  |  | $ 54.7 |  | $ 31.9
Warrants acquired in second quarter of 2020 |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Exercise price of warrants | $ / shares |  |  | $ 2.50 |  | $ 2.50 |
Term of warrants |  |  | 5 years |  | 5 years |
Warrants acquired in third quarter of 2020 |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Exercise price of warrants | $ / shares |  | $ 2.675 |  |  |  |
Term of warrants |  | 5 years |  |  |  |
Warrants acquired in second quarter of 2021 |  |  |  |  |  |
Equity Investment |  |  |  |  |  |
Exercise price of warrants | $ / shares | $ 2.00 |  |  | $ 2.00 |  |
Term of warrants | 5 years |  |  | 5 years |  |

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