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Goodwill and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Goodwill and Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,120.5		$ 1,202.8	$ 1,214.5	$ 1,271.3
Goodwill, Period Increase (Decrease)	0.0
Accumulated impairment losses	(470.9)			(470.9)	(470.9)
Beginning balance		$ 743.6	743.6
Transferred to assets held for sale	0.0
Divestitures		(3.3)
Currency translation adjustment	(82.3)	(53.5)	(11.7)
Ending balance	649.6
Eurasia Banking Segment [Member]
Goodwill [Line Items]
Goodwill	0.0		555.1	561.4	590.4
Goodwill, Period Increase (Decrease)	(291.7)
Accumulated impairment losses	0.0			(291.7)	(291.7)
Beginning balance		269.7	269.7
Transferred to assets held for sale	(555.1)
Divestitures		0.0
Currency translation adjustment	0.0	(29.0)	(6.3)
Ending balance	$ 0.0
Segment Reporting, Additional Information about Entity's Reportable Segments	10 percent
Americas Banking Segment [Member]
Goodwill [Line Items]
Goodwill	$ 0.0		439.1	440.1	444.7
Goodwill, Period Increase (Decrease)	(122.0)
Accumulated impairment losses	0.0			(122.0)	(122.0)
Beginning balance		318.1	318.1
Transferred to assets held for sale	(439.1)
Divestitures		0.0
Currency translation adjustment	0.0	(4.6)	(1.0)
Ending balance	0.0
Global Retail [Member]
Goodwill [Line Items]
Goodwill	253.7		208.6	213.0	236.2
Goodwill, Period Increase (Decrease)	0.0
Accumulated impairment losses	(57.2)			$ (57.2)	$ (57.2)
Beginning balance		155.8	155.8
Transferred to assets held for sale	72.0
Divestitures		(3.3)
Currency translation adjustment	(26.9)	$ (19.9)	$ (4.4)
Ending balance	$ 196.5
Segment Reporting, Additional Information about Entity's Reportable Segments	110 percent
Global Banking
Goodwill [Line Items]
Goodwill	$ 866.8
Goodwill, Period Increase (Decrease)	413.7
Accumulated impairment losses	(413.7)
Transferred to assets held for sale	922.2
Currency translation adjustment	(55.4)
Ending balance	$ 453.1
Segment Reporting, Additional Information about Entity's Reportable Segments	130 percent