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v3.20.2

Borrowings - Senior notes and Subordinate Notes (Details) - USD ($) $ in Millions | Jun. 01, 2020 | May 25, 2017 | Jun. 30, 2020 | Dec. 31, 2019
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3.75% notes maturing May 25, 2022 | Senior notes |  |  |  |
Long-term debt |  |  |  |
Issuance of debt |  | $ 40.0 |  |
Interest rate (as a percent) |  | 3.75% |  |
Unamortized debt issuance cost |  |  | $ 0.3 | $ 0.3
4.75% notes maturing May 25, 2027 | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Issuance of debt |  | $ 60.0 |  |
Unamortized debt issuance cost |  |  | 0.7 | $ 0.8
4.75% notes maturing May 25, 2027 | First Five Years | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  | 4.75% |  |
4.75% notes maturing May 25, 2027 | Three-month LIBOR | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Floating interest rate margin (as a percent) |  | 2.919% |  |
5.25% notes maturing June 1, 2030 | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Issuance of debt | $ 125.0 |  |  |
Floating interest rate margin (as a percent) | 5.11% |  |  |
Unamortized debt issuance cost |  |  | $ 2.3 |
5.25% notes maturing June 1, 2030 | First Five Years | Subordinated debt |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) | 5.25% |  |  |

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