Goodwill and Other Assets (Textuals) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Goodwill [Line Items]
Amortization	$ 24.7	$ 24.6	$ 48.0	$ 48.9
Goodwill	713.4		713.4		$ 702.3
Global Retail [Member]
Goodwill [Line Items]
Goodwill	$ 215.8		215.8		212.4
Segment Reporting, Additional Information about Entity's Reportable Segments	34 percent
Global Banking
Goodwill [Line Items]
Goodwill	$ 497.6		$ 497.6		$ 489.9
Segment Reporting, Additional Information about Entity's Reportable Segments	43 percent