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Goodwill and Other Assets (Textuals) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Amortization	$ 23.2	$ 26.0	$ 72.1	$ 78.1
Goodwill	649.6		649.6		$ 743.6	$ 800.4
Eurasia Banking Segment [Member]
Goodwill [Line Items]
Goodwill	$ 0.0		0.0		269.7	298.7
Segment Reporting, Additional Information about Entity's Reportable Segments	10 percent
Americas Banking Segment [Member]
Goodwill [Line Items]
Goodwill	$ 0.0		0.0		318.1	322.7
Global Retail [Member]
Goodwill [Line Items]
Goodwill	$ 196.5		196.5		$ 155.8	$ 179.0
Segment Reporting, Additional Information about Entity's Reportable Segments	110 percent
Global Banking
Goodwill [Line Items]
Goodwill	$ 453.1		$ 453.1
Segment Reporting, Additional Information about Entity's Reportable Segments	130 percent