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Goodwill and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
Goodwill and Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 1,321.8			$ 1,335.3	$ 1,407.8
Accumulated impairment losses	(508.2)			(508.2)	(290.7)
Beginning balance	827.1			1,117.1
Transferred to assets held for sale				(47.0)
Currency translation adjustment	(10.5)			(25.5)
Impairment		$ (134.4)	$ (83.1)	(217.5)
Divestitures	(3.0)
Ending balance	813.6			827.1
Eurasia Banking
Goodwill [Line Items]
Goodwill	624.4			628.6	639.4
Accumulated impairment losses	(321.7)			(321.7)	(168.7)
Beginning balance	306.9			470.7
Transferred to assets held for sale				(0.8)
Currency translation adjustment	(4.2)			(10.0)
Impairment				(153.0)
Divestitures	0.0
Ending balance	302.7			306.9
Americas Banking
Goodwill [Line Items]
Goodwill	450.8			454.3	462.9
Accumulated impairment losses	(122.0)			(122.0)	(122.0)
Beginning balance	332.3			340.9
Transferred to assets held for sale				(0.3)
Currency translation adjustment	(3.5)			(8.3)
Impairment				0.0
Divestitures	0.0
Ending balance	328.8			332.3
Retail
Goodwill [Line Items]
Goodwill	246.6			252.4	305.5
Accumulated impairment losses	(64.5)			(64.5)	$ 0.0
Beginning balance	187.9			305.5
Transferred to assets held for sale				(45.9)
Currency translation adjustment	(2.8)			(7.2)
Impairment				(64.5)
Divestitures	(3.0)
Ending balance	$ 182.1			$ 187.9