Goodwill and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,159.8	$ 1,202.8	$ 1,214.5	$ 1,271.3
Goodwill, Period Increase (Decrease)	0.0
Accumulated impairment losses	(470.9)	(470.9)	(470.9)	(470.9)
Beginning balance	731.9	743.6	800.4
Transferred to assets held for sale	0.0
Divestitures			(3.3)
Currency translation adjustment	(43.0)	(11.7)	(53.5)
Ending balance	688.9	731.9	743.6
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)	(291.7)
Beginning balance	263.4	269.7	298.7
Transferred to assets held for sale	(555.1)
Divestitures			0.0
Currency translation adjustment	0.0	(6.3)	(29.0)
Ending balance	$ 0.0	263.4	269.7
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)	(122.0)
Beginning balance	317.1	318.1	322.7
Transferred to assets held for sale	(439.1)
Divestitures			0.0
Currency translation adjustment	0.0	(1.0)	(4.6)
Ending balance	0.0	317.1	318.1
Global Retail [Member]
Goodwill [Line Items]
Goodwill	265.6	208.6	213.0	236.2
Goodwill, Period Increase (Decrease)	0.0
Accumulated impairment losses	(57.2)		(57.2)	$ (57.2)
Beginning balance	151.4	155.8	179.0
Transferred to assets held for sale	72.0
Divestitures			(3.3)
Currency translation adjustment	(15.0)	(4.4)	(19.9)
Ending balance	$ 208.4	$ 151.4	$ 155.8
Segment Reporting, Additional Information about Entity's Reportable Segments	110 percent
Global Banking
Goodwill [Line Items]
Goodwill	$ 894.2
Goodwill, Period Increase (Decrease)	413.7
Accumulated impairment losses	(413.7)
Transferred to assets held for sale	922.2
Currency translation adjustment	(28.0)
Ending balance	$ 480.5
Segment Reporting, Additional Information about Entity's Reportable Segments	130 percent

Additional information about the entity or its reportable segments that may contribute to an understanding of the enterprise.

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