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Goodwill and Other Assets (Textuals) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Amortization	$ 24.6	$ 26.0	$ 48.9	$ 52.1
Goodwill	688.9		688.9		$ 731.9	$ 743.6	$ 800.4
Eurasia Banking Segment [Member]
Goodwill [Line Items]
Goodwill	$ 0.0		0.0		263.4	269.7	298.7
Segment Reporting, Additional Information about Entity's Reportable Segments	10 percent
Global Retail [Member]
Goodwill [Line Items]
Goodwill	$ 208.4		208.4		$ 151.4	$ 155.8	$ 179.0
Segment Reporting, Additional Information about Entity's Reportable Segments	110 percent
Global Banking
Goodwill [Line Items]
Goodwill	$ 480.5		$ 480.5
Segment Reporting, Additional Information about Entity's Reportable Segments	130 percent