Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 1,214.5	$ 1,271.3	$ 1,234.9
Accumulated impairment losses	(470.9)	(470.9)	(470.9)
Beginning balance	800.4	764.0
Divestitures	(0.3)	(11.4)
Transferred to assets held for sale	(3.0)
Currency translation adjustment	(53.5)	47.8
Ending balance	743.6	800.4
Eurasia Banking Segment [Member]
Goodwill [Line Items]
Goodwill	561.4	590.4	579.2
Accumulated impairment losses	(291.7)	(291.7)	(291.7)
Beginning balance	298.7	287.5
Divestitures	0.0	(7.8)
Transferred to assets held for sale	0.0
Currency translation adjustment	(29.0)	19.0
Ending balance	269.7	298.7
Americas Banking Segment [Member]
Goodwill [Line Items]
Goodwill	440.1	444.7	431.3
Accumulated impairment losses	(122.0)	(122.0)	(122.0)
Beginning balance	322.7	309.3
Divestitures	0.0	(2.4)
Transferred to assets held for sale	0.0
Currency translation adjustment	(4.6)	15.8
Ending balance	318.1	322.7
Retail Segment [Member]
Goodwill [Line Items]
Goodwill	213.0	236.2	224.4
Accumulated impairment losses	(57.2)	(57.2)	$ (57.2)
Beginning balance	179.0	167.2
Divestitures	(0.3)	(1.2)
Transferred to assets held for sale	(3.0)
Currency translation adjustment	(19.9)	13.0
Ending balance	$ 155.8	$ 179.0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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