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Goodwill and Other Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
Goodwill and Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill			$ 1,281.6		$ 1,335.3	$ 1,407.8
Accumulated impairment losses			(508.2)		(508.2)	(290.7)
Beginning balance			827.1	$ 1,117.1	1,117.1
Transferred to assets held for sale			(7.8)		(47.0)
Currency translation adjustment			(41.6)		(25.5)
Impairment	$ (134.4)	$ (83.1)		(83.1)	(217.5)
Divestitures			(4.3)
Ending balance			773.4		827.1
Eurasia Banking
Goodwill [Line Items]
Goodwill			603.8		628.6	639.4
Accumulated impairment losses			(321.7)		(321.7)	(168.7)
Beginning balance			306.9	470.7	470.7
Transferred to assets held for sale			(7.8)		(0.8)
Currency translation adjustment			(16.6)		(10.0)
Impairment					(153.0)
Divestitures			(0.4)
Ending balance			282.1		306.9
Americas Banking
Goodwill [Line Items]
Goodwill			440.6		454.3	462.9
Accumulated impairment losses			(122.0)		(122.0)	(122.0)
Beginning balance			332.3	340.9	340.9
Transferred to assets held for sale			0.0		(0.3)
Currency translation adjustment			(13.7)		(8.3)
Impairment					0.0
Divestitures			0.0
Ending balance			318.6		332.3
Retail
Goodwill [Line Items]
Goodwill			237.2		252.4	305.5
Accumulated impairment losses			(64.5)		(64.5)	$ 0.0
Beginning balance			187.9	$ 305.5	305.5
Transferred to assets held for sale			0.0		(45.9)
Currency translation adjustment			(11.3)		(7.2)
Impairment					(64.5)
Divestitures			(3.9)
Ending balance			$ 172.7		$ 187.9