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Equity (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 54 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 14, 2019 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Quarterly dividend on all classes of common stock (in dollars per share) | $ 0.80 | $ 0.70 | $ 0.70 | $ 0.70 | $ 0.70 |  |  |
Capital required for capital adequacy | $ 649,300,000 | $ 618,800,000 |  |  |  | $ 649,300,000 |  |
Capital | 815,100,000 | 815,400,000 |  |  |  | 815,100,000 |  |
Excess capital | $ 165,800,000 | $ 196,600,000 |  |  |  | $ 165,800,000 |  |
Class C non-voting common stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock authorized for repurchase |  |  |  |  |  |  | $ 10,000,000.0 | $ 25,000,000.0
Shares repurchased (in shares) | 4 |  |  |  |  | 673 |  |
Shares repurchased | $ 200,000 |  |  |  |  | $ 19,800,000 |  |

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