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Goodwill and Other Assets (Textuals) (Details) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Number of Reportable Segments				3
Goodwill, Impairment Loss		$ 134.4	$ 83.1		$ 83.1	$ 217.5
Amortization of internally-developed software	$ 8.2	8.8		$ 25.1	25.6
Amortization	$ 35.9	$ 38.2		$ 109.5	$ 114.8
Retail
Goodwill, Impairment Loss						64.5
Eurasia Banking
Goodwill, Impairment Loss						153.0
Americas Banking
Goodwill, Impairment Loss						$ 0.0
Americas Banking Reporting Unit [Member]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount						20.00%
EMEA Retail Reporting Unit [Member]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount						10.00%
Rest of World Retail Reporting Unit [Member]
Reporting Unit, Amount of Fair Value in Excess of Carrying Amount						$ 0.0