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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - 5% Convertible Senior Notes due 2021 - USD ($) $ in Millions | Dec. 31, 2019 | Jun. 30, 2016 | Jun. 27, 2016
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Debt instrument, interest rate | 5.00% | 5.00% |
Convertible Debt |  |  |
Debt instrument, interest rate | 5.00% |  |
Debt instrument, convertible, carrying amount of equity component | $ 28.7 |  | $ 22.2

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