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Goodwill and Other Assets (Textuals) (Details) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 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	$ 8.3		8.0	$ 16.9	$ 16.8
Amortization	$ 36.5		$ 36.7	$ 73.6	$ 76.6
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