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Investment Securities (Investment Gains (Losses) For Level 3) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment securities |  |  |
Unrealized investment gains | $ 336.9 | $ (83.6) | $ 97.5
Other long-term investments |  |  |
Investment securities |  |  |
Unrealized investment gains | 188.5 | 30.2 | (15.6)
Other long-term investments | Level 3 Inputs |  |  |
Investment securities |  |  |
Unrealized investment gains | $ 181.9 | $ 22.6 | $ (15.4)

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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References No definition available. + Details
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