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SHARE-BASED COMPENSATION PROGRAMS - TEXTUAL (Details) - USD ($) $ / shares in Units, $ in Millions						3 Months Ended			9 Months Ended
	Jun. 11, 2018	May 17, 2018	May 09, 2018	Apr. 06, 2018	Mar. 26, 2018	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of AB Holding units									$ 59.0	$ 0.0
Compensation costs						$ 20.5		$ 10.1	$ 35.2	$ 45.1
Shares to be repurchased next year (in shares)							30,000
Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)	900,000
Holdings \| Non-officer Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs							$ 0.6
Shares issued (in shares)									30,000
Exercise price (in usd per share)									$ 21.68
Alliance Bernstein
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchased Holding Units to help fund anticipated obligations under its incentive compensation award program shares (in shares)						1,600,000		300,000	2,900,000	5,900,000
Repurchase of AB Holding units						$ 48.0		$ 7.0	$ 83.0	$ 135.0
Open market purchase (in shares)						1,600,000		300,000	2,800,000	5,200,000
Open market purchase						$ 48.0		$ 6.8	$ 80.9	$ 117.1
Restricted holding unit awards granted to employees (in shares)									600,000	1,000,000
Restricted holding unit awards granted to employees									$ 11.0	$ 18.0
Alliance Bernstein \| Employees and eligible Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted holding unit awards granted to employees (in shares)									2,500,000	2,100,000
AXA Performance Share Plan 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share distributions				$ 6.0	$ 20.0
Share distributions (in shares)				200,000	800,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs						4.3		2.6	$ 9.9	$ 15.6
Performance Shares \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)		400,000
Compensation cost not yet recognized						4.0			4.0
Compensation costs						0.9
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs						0.6		$ 0.4	1.1	$ 1.1
Stock Options \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized						4.0			$ 4.0
Compensation costs						$ 0.7
Granted in period, weighted average grant date fair value (in usd per share)	$ 21.34
Exercise price (in usd per share)	$ 4.61
Expected volatility									25.40%
Expected term									5 years 8 months 12 days
Expected dividend rate									2.44%
Risk free rate									2.83%
Vesting period									3 years
Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards authorized (in shares)						5,900,000			5,900,000
Transaction Incentive Grant Awards \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)			600,000
Compensation cost not yet recognized						$ 2.6			$ 2.6
Requisite service period									5 years
Transaction Incentive Grant Awards \| RSU Service Units \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent									50.00%
Vesting period									2 years
Transaction Incentive Grant Awards \| RSU Performance Units \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)			158,000
Vesting percent									50.00%
Compensation cost not yet recognized						3.2			$ 3.2
All-Employee Award \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)			200,000
Grants in period on individual basis (in shares)			50
Compensation cost not yet recognized						4.8			$ 4.8
Compensation costs						1.7
Recognition period for compensation costs									6 months
Annual Awards 2018 \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)		800,000
Share price (in usd per share)											$ 21.68
Compensation cost not yet recognized						17.8			$ 17.8
Compensation costs						1.8
Vesting period									3 years
Annual Awards 2018 \| Cash-settled RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)		500,000
TSR Performance Share Plan \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in usd per share)		$ 23.17
Minimum \| Performance Shares \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential shares earned, percent									0.00%
Minimum \| Transaction Incentive Grant Awards \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price growth rate									130.00%
Minimum \| Transaction Incentive Grant Awards \| RSU Performance Units \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period									2 years
Maximum \| Performance Shares \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential shares earned, percent									200.00%
Maximum \| Transaction Incentive Grant Awards \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price growth rate									150.00%
Maximum \| Transaction Incentive Grant Awards \| RSU Performance Units \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period									5 years
Period One \| Stock Options \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent									33.33%
Period One \| Annual Awards 2018 \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent									33.33%
Period Two \| Stock Options \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent									33.33%
Period Two \| Transaction Incentive Grant Awards \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value						6.3			$ 6.3
Period Two \| Transaction Incentive Grant Awards \| RSU Performance Units \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)			316,017
Period Two \| Annual Awards 2018 \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent									33.33%
Period Three \| Stock Options \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent									33.33%
Period Three \| Transaction Incentive Grant Awards \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs						$ 2.2
Period Three \| Transaction Incentive Grant Awards \| RSU Performance Units \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period, weighted average grant date fair value (in usd per share)			$ 16.47
Period Three \| Annual Awards 2018 \| Restricted Stock Units (RSUs) \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent									33.33%
IPO \| Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share price (in usd per share)			$ 20