SHARE-BASED AND OTHER COMPENSATION PROGRAMS - Stock Options Narrative (Details) $ / shares in Units, $ in Millions							12 Months Ended
	Jun. 21, 2017 USD ($) shares	Jun. 21, 2017 € / shares	Jun. 06, 2016 USD ($) shares	Jun. 06, 2016 € / shares	Jun. 19, 2015 USD ($) shares	Jun. 19, 2015 € / shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares € / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares
Summary of Plan Activity [Line Items]
Share based compensation expense							$ 215.0		$ 187.0	$ 211.0
Tax benefits from exercise of stock options										0.1
Stock Options (Other than AB stock options)
Summary of Plan Activity [Line Items]
Share based compensation expense							$ 1.0		$ 1.0	1.0
Stock options exercised during period | shares							0		0
Stock options, exercises in period, intrinsic value										0.2
Tax benefits from exercise of stock options										0.1
Parent | Stock Option Plan 2017
Summary of Plan Activity [Line Items]
Stock options granted (in shares) | shares	500,000
Stock options granted, exercise price (in dollars and euros per share) | € / shares		€ 23.92
Vesting period	5 years
Weighted average grant date fair value (in dollars and euros per share) | € / shares		€ 1.78
Term/expiration period	10 years
Fair value assumptions, expected volatility rate	25.05%
Weighted average expected term	8 years 9 months 18 days
Fair value assumptions, risk expected dividend yield	6.53%
Fair value assumptions, risk free interest rate	0.59%
Fair value of options (net of expected forfeitures)	$ 1.0
Share based compensation expense							$ 0.5
Parent | Stock Option Plan 2017 | Vesting tranche one
Summary of Plan Activity [Line Items]
Vesting percentage	33.33%
Parent | Stock Option Plan 2017 | Vesting tranche two
Summary of Plan Activity [Line Items]
Vesting percentage	33.33%
Parent | Stock Option Plan 2017 | Vesting tranche three
Summary of Plan Activity [Line Items]
Vesting percentage	33.33%
Parent | Stock Option Plan 2017 | Conditional Vesting Term
Summary of Plan Activity [Line Items]
Stock options granted (in shares) | shares	300,000
Parent | Stock Option Plan 2016
Summary of Plan Activity [Line Items]
Stock options granted (in shares) | shares			600,000
Stock options granted, exercise price (in dollars and euros per share) | € / shares				€ 21.52
Vesting period			5 years
Weighted average grant date fair value (in dollars and euros per share) | € / shares				€ 1.85
Term/expiration period			10 years
Fair value assumptions, expected volatility rate			26.60%
Weighted average expected term			8 years 1 month 6 days
Fair value assumptions, risk expected dividend yield			6.49%
Fair value assumptions, risk free interest rate			0.33%
Fair value of options (net of expected forfeitures)			$ 1.0
Share based compensation expense							0.1		$ 0.6
Parent | Stock Option Plan 2016 | Vesting tranche one
Summary of Plan Activity [Line Items]
Vesting percentage			33.33%
Parent | Stock Option Plan 2016 | Vesting tranche two
Summary of Plan Activity [Line Items]
Vesting percentage			33.33%
Parent | Stock Option Plan 2016 | Vesting tranche three
Summary of Plan Activity [Line Items]
Vesting percentage			33.33%
Parent | Stock Option Plan 2016 | Conditional Vesting Term
Summary of Plan Activity [Line Items]
Stock options granted (in shares) | shares			300,000
Parent | Stock Option Plan 2015
Summary of Plan Activity [Line Items]
Stock options granted (in shares) | shares					400,000
Stock options granted, exercise price (in dollars and euros per share) | € / shares						€ 22.90
Vesting period					5 years
Weighted average grant date fair value (in dollars and euros per share) | € / shares						€ 1.58
Term/expiration period					10 years
Fair value assumptions, expected volatility rate					23.68%
Weighted average expected term					8 years 2 months 12 days
Fair value assumptions, risk expected dividend yield					6.29%
Fair value assumptions, risk free interest rate					0.92%
Fair value of options (net of expected forfeitures)					$ 1.0
Share based compensation expense							$ 0.1		$ 0.1	$ 0.3
Parent | Stock Option Plan 2015 | Vesting tranche one
Summary of Plan Activity [Line Items]
Vesting percentage					33.33%
Parent | Stock Option Plan 2015 | Vesting tranche two
Summary of Plan Activity [Line Items]
Vesting percentage					33.33%
Parent | Stock Option Plan 2015 | Vesting tranche three
Summary of Plan Activity [Line Items]
Vesting percentage					33.33%
Parent | Stock Option Plan 2015 | Conditional Vesting Term
Summary of Plan Activity [Line Items]
Stock options granted (in shares) | shares					200,000.0
Parent | AXA Ordinary Shares
Summary of Plan Activity [Line Items]
Stock options granted (in shares) | shares							488,000
Stock options granted, exercise price (in dollars and euros per share) | € / shares								€ 23.92
Weighted average grant date fair value (in dollars and euros per share) | $ / shares							$ 2.01		$ 2.06	$ 1.73
Fair value assumptions, expected volatility rate							25.05%		26.60%	23.68%
Weighted average expected term							8 years 9 months 29 days		8 years 1 month 6 days	8 years 2 months 12 days
Fair value assumptions, risk expected dividend yield							6.53%		6.49%	6.29%
Fair value assumptions, risk free interest rate							0.59%		0.33%	0.92%
Stock options exercised during period | shares							1,996,000
Common stock, capital shares reserved for future issuance (in shares) | shares							22,974	22,974
Shares held in treasury at weighted average cost (in dollars per share) | $ / shares							$ 23.14	€ 23.14
Parent | Stock Options (Other than AB stock options)
Summary of Plan Activity [Line Items]
Compensation cost not yet recognized							$ 1.0	€ 1.0
Compensation cost, recognition period							2 years 9 months 18 days