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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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 1,373.3		$ 1,373.3	$ 1,407.8	$ 1,289.0
Accumulated impairment losses	(490.0)		(490.0)	(290.7)	(290.7)
Beginning balance			1,117.1	998.3
Goodwill acquired				5.6
Goodwill adjustment				(2.9)
Currency translation adjustment			(34.5)	116.1
Goodwill, Impairment Loss	(109.3)	$ (90.0)	(199.3)
Ending balance	883.3		883.3	1,117.1
Eurasia Banking
Goodwill [Line Items]
Goodwill	567.4		567.4	585.3	513.0
Accumulated impairment losses	(266.8)		(266.8)	(168.7)	(168.7)
Beginning balance			416.6	344.3
Goodwill acquired				1.6
Goodwill adjustment				(1.1)
Currency translation adjustment			(17.9)	71.8
Goodwill, Impairment Loss			(98.1)
Ending balance	300.6		300.6	416.6
Americas Banking
Goodwill [Line Items]
Goodwill	421.1		421.1	426.6	425.4
Accumulated impairment losses	(122.0)		(122.0)	(122.0)	(122.0)
Beginning balance			304.6	303.4
Goodwill acquired				0.0
Goodwill adjustment				(1.0)
Currency translation adjustment			(5.5)	2.2
Goodwill, Impairment Loss			0.0
Ending balance	299.1		299.1	304.6
Retail
Goodwill [Line Items]
Goodwill	384.8		384.8	395.9	350.6
Accumulated impairment losses	(101.2)		(101.2)	0.0	$ 0.0
Beginning balance			395.9	350.6
Goodwill acquired				4.0
Goodwill adjustment				(0.8)
Currency translation adjustment			(11.1)	42.1
Goodwill, Impairment Loss			(101.2)
Ending balance	$ 283.6		$ 283.6	$ 395.9