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Investment Securities (Investment gains (losses) for Level 3) (Details) - Level 3 Inputs - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Unrealized gains (losses) on investments | $ 25.3 | $ (14.0) | $ 15.9 | $ 100.0
Other long-term investments |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Unrealized gains (losses) on investments | $ 25.3 | $ (14.0) | $ 15.9 | $ 100.0

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