DEBT AND OTHER OBLIGATIONS (Details) $ in Thousands					1 Months Ended	8 Months Ended	9 Months Ended	12 Months Ended
	Feb. 03, 2015	Feb. 02, 2015 USD ($)	Feb. 01, 2015 USD ($)	Oct. 10, 2012 USD ($)	Jan. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Jun. 25, 2014 USD ($)	Aug. 07, 2013 USD ($)	Dec. 10, 2010 USD ($)	Apr. 23, 2010 USD ($)
DEBT AND OTHER OBLIGATIONS
Non-recourse funding obligations						$ 1,939,078
Repurchase Program Borrowings
Repurchase obligation						455,718
Collateral pledged for repurchase agreements						500,542
U.S. government-related securities.
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						159,775
Loans
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						340,767
Overnight and Continuous
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						465,256
Overnight and Continuous | U.S. government-related securities.
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						124,489
Overnight and Continuous | Loans
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						340,767
Up to 30 days
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						20,257
Up to 30 days | U.S. government-related securities.
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						20,257
30-90 days
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						15,029
30-90 days | U.S. government-related securities.
Repurchase Program Borrowings
Collateral pledged for repurchase agreements						15,029
Repurchase Program Borrowings
Repurchase Program Borrowings
Fair value of securities pledged under the repurchase program						500,500
Repurchase obligation						$ 455,700
Average borrowing rate (as a percent)						0.22%
Maximum outstanding balance						$ 652,200
Average daily balance						$ 530,500
Average daily borrowing rate (as a percent)						0.18%
Repurchase Program Borrowings | Maximum
Repurchase Program Borrowings
Term of debt						90 days
Credit Facility
DEBT AND OTHER OBLIGATIONS
Line of credit, maximum borrowing capacity			$ 750,000
Base of floating rate interest payments			LIBOR
Facility fee percentage			0.175%
Line of credit, maximum borrowing capacity to be granted upon entity's request			$ 1,000,000
Credit Facility | Prime rate
DEBT AND OTHER OBLIGATIONS
Base of floating rate interest payments			prime rate
Credit Facility | Federal funds rate
DEBT AND OTHER OBLIGATIONS
Base of floating rate interest payments			Federal Funds rate
Interest rate added to the base rate (as a percent)			0.50%
Credit Facility | LIBOR One-Month Rate
DEBT AND OTHER OBLIGATIONS
Base of floating rate interest payments			one-month LIBOR
Interest rate added to the base rate (as a percent)			1.00%
2015 Credit Facility
DEBT AND OTHER OBLIGATIONS
Line of credit, maximum borrowing capacity		$ 1,000,000
Base of floating rate interest payments		LIBOR
Facility fee percentage	0.125%	0.15%
Line of credit, maximum borrowing capacity to be granted upon entity's request		$ 1,250,000
2015 Credit Facility | Prime rate
DEBT AND OTHER OBLIGATIONS
Base of floating rate interest payments		prime rate
2015 Credit Facility | Federal funds rate
DEBT AND OTHER OBLIGATIONS
Base of floating rate interest payments		Federal Funds rate
Interest rate added to the base rate (as a percent)		0.50%
2015 Credit Facility | LIBOR One-Month Rate
DEBT AND OTHER OBLIGATIONS
Base of floating rate interest payments		one-month LIBOR
Interest rate added to the base rate (as a percent)		1.00%
Letter of Credit
DEBT AND OTHER OBLIGATIONS
Previously executed Letter of Credit no longer issued and outstanding						$ 55,000
Golden Gate
DEBT AND OTHER OBLIGATIONS
Non-recourse funding obligations						$ 1,150,551
Year-to-date weighted-average interest rate of non-recourse funding obligations (as a percent)						4.66%
Golden Gate | Non-recourse Funding Obligations Series
DEBT AND OTHER OBLIGATIONS
Number of series of Surplus Notes | item						3
Outstanding Surplus Notes						$ 800,000
Golden Gate | Series A1 Non-recourse Funding Obligation
DEBT AND OTHER OBLIGATIONS
Outstanding Surplus Notes						$ 400,000
Fixed interest rate (as a percent)						7.375%
Golden Gate | Series A2 Non-recourse Funding Obligation
DEBT AND OTHER OBLIGATIONS
Outstanding Surplus Notes						$ 100,000
Fixed interest rate (as a percent)						8.00%
Golden Gate | Series A3 Non-recourse Funding Obligation
DEBT AND OTHER OBLIGATIONS
Outstanding Surplus Notes						$ 300,000
Fixed interest rate (as a percent)						8.45%
Golden Gate II
DEBT AND OTHER OBLIGATIONS
Outstanding non-recourse funding obligations						$ 575,000
Non-recourse funding obligations held by external parties						144,900
Non-recourse funding obligations held by nonconsolidated affiliates						145,300
Non-recourse funding obligations held by consolidated subsidiaries of the Company						284,800
Payments made under the agreements						0
Non-recourse funding obligations						$ 235,910
Year-to-date weighted-average interest rate of non-recourse funding obligations (as a percent)						1.19%
Repurchase Program Borrowings
Amount of collateralized support agreement obligations by PLC						$ 1,900
PLC | 2015 Credit Facility
DEBT AND OTHER OBLIGATIONS
Line of credit, amount outstanding						$ 495,000
Base of floating rate interest payments						LIBOR
Interest rate added to the base rate (as a percent)						1.00%
Golden Gate V and Red Mountain
DEBT AND OTHER OBLIGATIONS
Transaction period of financing for reserves related to a block of universal life insurance policies with secondary guarantees				20 years
Maximum amount to be financed for reserves related to a block of universal life insurance policies with secondary guarantees				$ 945,000
Red Mountain
DEBT AND OTHER OBLIGATIONS
Initial principal amount of note for deposit to a reinsurance trust				275,000
Maximum principal amount of note for deposit to a reinsurance trust				$ 945,000
Credit enhancement period for Red Mountain note				20 years
Principal balance of note						$ 485,000
Golden Gate V
DEBT AND OTHER OBLIGATIONS
Fixed interest rate (as a percent)						6.25%
Outstanding non-recourse funding obligations						$ 485,000
Future scheduled capital contributions to prefund credit enhancements fees amount						139,600
Payments made under the agreements						0
Maximum principal amount of non-recourse funding obligation						945,000
Non-recourse funding obligations						$ 550,079
Year-to-date weighted-average interest rate of non-recourse funding obligations (as a percent)						5.12%
Golden Gate III
DEBT AND OTHER OBLIGATIONS
Outstanding letters of credit (LOC)						$ 935,000
Payments made under the agreements						$ 0
Maximum LOC borrowing capacity									$ 915,000	$ 710,000		$ 505,000
Maximum stated amount up to which LOC may be increased									$ 935,000	$ 720,000		$ 610,000
Letter of credit term						15 years
Future scheduled capital contributions amount						$ 122,500
Number of installments for payment of capital contributions amount | item						3
Golden Gate IV
DEBT AND OTHER OBLIGATIONS
Payments made under the agreements						$ 0
Maximum LOC borrowing capacity						770,000					$ 270,000
Maximum stated amount up to which LOC may be increased						$ 790,000
Letter of credit term						12 years
MONY
DEBT AND OTHER OBLIGATIONS
Non-recourse funding obligations						$ 2,538
Year-to-date weighted-average interest rate of non-recourse funding obligations (as a percent)						6.19%
Predecessor
DEBT AND OTHER OBLIGATIONS
Non-recourse funding obligations								$ 1,527,752
Repurchase of outstanding non-recourse funding obligations							$ 6,000
Pre-tax gain on repurchase of debt							$ 1,500
Repurchase Program Borrowings
Repurchase obligation								50,000
Predecessor | Repurchase Program Borrowings
Repurchase Program Borrowings
Repurchase obligation								50,000
Maximum outstanding balance					$ 175,000			633,700
Average daily balance					$ 77,400			$ 470,400
Average daily borrowing rate (as a percent)					0.16%			0.11%
Predecessor | Letter of Credit
DEBT AND OTHER OBLIGATIONS
Outstanding letters of credit (LOC)								$ 55,000
Predecessor | PLC | Credit Facility
DEBT AND OTHER OBLIGATIONS
Line of credit, amount outstanding								$ 450,000
Predecessor | PLC | Credit Facility | LIBOR
DEBT AND OTHER OBLIGATIONS
Base of floating rate interest payments								LIBOR
Interest rate added to the base rate (as a percent)								1.20%