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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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