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Stockholders' Equity - Shareholder Rights Plan (Details) | Mar. 31, 2020 $ / shares shares | Sep. 30, 2020 $ / shares | Jun. 27, 2020 $ / shares | Dec. 31, 2019 $ / shares
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Equity [Abstract] |  |  |  |
Shareholder rights plan, ownership trigger threshold | 15.00% |  |  |
Right dividend declared, per share of common stock held | 1 |  |  |
Common stock, par value (in dollars per share) | $ 1.00 | $ 1 | $ 1.00 | $ 1
Number of securities called by each right (in shares) | shares | 0.5 |  |  |
Right, common stock purchase price (in dollars per share) | $ 22.50 |  |  |
Right, common stock purchase price, full right equivalent (in dollars per share) | $ 45.00 |  |  |

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