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Investment Securities (Debt Securities Issued By Corporation) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Investment securities |  |  |
Fair value investments | $ 2,746.0 | $ 2,328.7 | $ 3,208.3
Debt securities issued by corporations |  |  |
Investment securities |  |  |
Fair value investments | 467.2 | 510.5 |
AAA | Debt securities issued by corporations |  |  |
Investment securities |  |  |
Fair value investments | 9.5 | 8.9 |
AA | Debt securities issued by corporations |  |  |
Investment securities |  |  |
Fair value investments | 73.9 | 88.7 |
A | Debt securities issued by corporations |  |  |
Investment securities |  |  |
Fair value investments | 288.5 | 270.5 |
BBB | Debt securities issued by corporations |  |  |
Investment securities |  |  |
Fair value investments | $ 95.3 | $ 142.4 |

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