Goodwill and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 1,202.8		$ 1,214.5	$ 1,271.3
Accumulated impairment losses	(470.9)		(470.9)	(470.9)
Beginning balance	743.6	$ 800.4
Transferred to assets held for sale		0.0
Divestitures		(3.3)
Currency translation adjustment	(11.7)	(53.5)
Ending balance	731.9
Eurasia Banking
Goodwill [Line Items]
Goodwill	555.1		561.4	590.4
Accumulated impairment losses	(291.7)		(291.7)	(291.7)
Beginning balance	269.7	298.7
Transferred to assets held for sale		0.0
Divestitures		0.0
Currency translation adjustment	(6.3)	(29.0)
Ending balance	263.4
Americas Banking
Goodwill [Line Items]
Goodwill	439.1		440.1	444.7
Accumulated impairment losses	(122.0)		(122.0)	(122.0)
Beginning balance	318.1	322.7
Transferred to assets held for sale		0.0
Divestitures		0.0
Currency translation adjustment	(1.0)	(4.6)
Ending balance	317.1
Retail
Goodwill [Line Items]
Goodwill	208.6		213.0	236.2
Accumulated impairment losses	(57.2)		$ (57.2)	$ (57.2)
Beginning balance	155.8	179.0
Transferred to assets held for sale		0.0
Divestitures		(3.3)
Currency translation adjustment	(4.4)	$ (19.9)
Ending balance	$ 151.4