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Goodwill and Other Assets (Textuals) (Details) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Number of Reportable Segments	3
Goodwill, Impairment Loss		$ 134.4	$ 83.1		$ 217.5
Amortization of internally-developed software	$ 8.6			$ 8.8
Amortization	$ 37.1			$ 39.9
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