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SHARE-BASED COMPENSATION PROGRAMS - TEXTUAL (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		6 Months Ended
	Jun. 11, 2018	May 17, 2018	May 09, 2018	Mar. 26, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of AB Holding units							$ 25.0	$ 128.0
Compensation costs					$ 0.6	$ 23.9	$ 14.7	$ 35.0
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)					1,200,000	4,300,000	1,200,000	5,700,000
Repurchase of AB Holding units					$ 33.0	$ 97.0	$ 35.0	$ 128.0
Open market purchase (in shares)						3,700,000		4,900,000
Open market purchase					1.2	$ 82.0	$ 33.0	$ 110.0
Restricted holding unit awards granted to employees (in shares)							500,000	500,000
Restricted holding unit awards granted to employees							$ 8.0	$ 9.0
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)							2,400,000	2,000,000
AXA Performance Share Plan 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share distributions				$ 20.0
Share distributions (in shares)				0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs					3.0	9.6	$ 5.6	$ 13.0
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					0.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs					1.4	$ 0.7	0.5	$ 0.7
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					$ 0.2
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					1.4
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					1.3
Vesting period							3 years
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)			316,000
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					$ 0.8
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