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Stockholders' Equity - Repurchases of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Class of Stock |  |  |
Payment for shares acquired |  | $ 33.1 | $ 445.1
Common Stock |  |  |
Class of Stock |  |  |
Treasury shares acquired (in shares) | 0 | 3,700,000 |
Payment for shares acquired |  | $ 33.1 |
Treasury stock price (usd per share) |  | $ 8.82 |
Remaining shares authorized for repurchase | $ 210.0 | $ 210.0 |

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