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Investment Securities (Investment gains (losses) for Level 3) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Debt and Equity Securities, FV-NI [Line Items] |  |
Unrealized gains (losses) on investments | $ 220.2 | $ (37.9)
Other long-term investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Unrealized gains (losses) on investments | 112.7 | (1.9)
Level 3 Inputs |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Unrealized gains (losses) on investments | 114.0 | (5.1)
Level 3 Inputs | Other long-term investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Unrealized gains (losses) on investments | $ 114.0 | $ (5.1)

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