ACQUISITIONS (Details) $ in Millions	Feb. 07, 2019 USD ($)	Oct. 20, 2017 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair values of assets acquired and liabilities assumed in acquisition
Goodwill			$ 954.9	$ 954.8	$ 992.8
Blispay
Components of consideration
Cash consideration	$ 6.7
Contingent consideration, guarantee	1.0
Fair values of assets acquired and liabilities assumed in acquisition
Capitalized software	5.0
Goodwill	2.3
Total assets acquired	7.3
Guarantee, fair value	$ 0.6
Signet
Acquisition
Number of employees | item		250
Components of consideration
Total consideration paid		$ 945.6
Gain on business combination		7.9
Fair values of assets acquired and liabilities assumed in acquisition
Credit card receivables		906.3
Intangible assets		52.3
Total assets acquired		958.6
Other liabilities		0.2
Deferred tax liability		4.9
Total liabilities assumed		5.1
Net assets acquired		$ 953.5