RESTRUCTURING AND OTHER CHARGES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring costs and reserve
Restructuring charges		$ 7.9
Restructuring, adjustment	$ (6.5)
Termination Benefits
Restructuring costs and reserve
Restructuring charges		1.2
Restructuring, adjustment	(6.5)
Asset Impairments
Restructuring costs and reserve
Restructuring charges		4.6
Other Exit Costs
Restructuring costs and reserve
Restructuring charges		2.1
Corporate/Other
Restructuring costs and reserve
Restructuring charges	(0.1)
Restructuring, adjustment	(0.1)
Corporate/Other | Termination Benefits
Restructuring costs and reserve
Restructuring, adjustment	(0.1)
LoyaltyOne
Restructuring costs and reserve
Restructuring charges		7.9
Restructuring, adjustment	0.1
LoyaltyOne | Termination Benefits
Restructuring costs and reserve
Restructuring charges		1.2
Restructuring, adjustment	0.1
LoyaltyOne | Asset Impairments
Restructuring costs and reserve
Restructuring charges		4.6
LoyaltyOne | Other Exit Costs
Restructuring costs and reserve
Restructuring charges		$ 2.1
Card Services
Restructuring costs and reserve
Restructuring, adjustment	(6.5)
Card Services | Termination Benefits
Restructuring costs and reserve
Restructuring, adjustment	$ (6.5)