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Investment Securities (Mortgage-backed, Asset-backed Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Fair value investments	$ 2,532.5	$ 3,208.3	$ 2,610.8	$ 2,547.3

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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