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Goodwill and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
Goodwill and Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill			$ 1,331.8	$ 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			0.4	(25.5)
Impairment	$ (134.4)	$ (83.1)		(217.5)
Divestitures			(3.9)
Ending balance			823.6	827.1
Eurasia Banking
Goodwill [Line Items]
Goodwill			628.8	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			0.2	(10.0)
Impairment				(153.0)
Divestitures			0.0
Ending balance			307.1	306.9
Americas Banking
Goodwill [Line Items]
Goodwill			454.4	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			0.1	(8.3)
Impairment				0.0
Divestitures			0.0
Ending balance			332.4	332.3
Retail
Goodwill [Line Items]
Goodwill			248.6	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			0.1	(7.2)
Impairment				(64.5)
Divestitures			(3.9)
Ending balance			$ 184.1	$ 187.9