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DEBT AND OTHER OBLIGATIONS - Summary of Debt and Subordinated Debt Securities (Details) - USD ($)
6 Months Ended 11 Months Ended
Feb. 03, 2015
Feb. 02, 2015
Jun. 30, 2016
Dec. 31, 2015
6.125% Subordinated Debentures (2004), due 2034, callable 2009        
Debt Instrument [Line Items]        
Stated interest rate (as a percent)     6.125%  
2015 Credit Facility        
Debt Instrument [Line Items]        
Line of credit, maximum borrowing capacity   $ 1,000,000,000.0    
Line of credit, maximum borrowing capacity to be granted upon entity's request   $ 1,250,000,000    
Base of floating rate interest rate payments   LIBOR    
Facility fee percentage 0.125% 0.15%    
Successor        
Debt Instrument [Line Items]        
Debt     $ 1,397,236,000 $ 1,588,806,000
Subordinated debt securities     445,023,000 448,763,000
Successor | 6.40% Senior Notes (2007), due 2018        
Debt Instrument [Line Items]        
Debt     $ 159,684,000 $ 162,671,000
Stated interest rate (as a percent)     6.40% 6.40%
Successor | 7.375% Senior Notes (2009), due 2019        
Debt Instrument [Line Items]        
Debt     $ 463,962,000 $ 473,127,000
Stated interest rate (as a percent)     7.375% 7.375%
Successor | 8.45% Senior Notes (2009), due 2039        
Debt Instrument [Line Items]        
Debt     $ 413,590,000 $ 468,008,000
Extinguishment of debt     52,800,000  
Par value of debt extinguished     $ 33,800,000  
Stated interest rate (as a percent)     8.45% 8.45%
Pre-tax gain on extinguishment of debt     $ 7,400,000  
Successor | 6.25% Subordinated Debentures (2012), due 2042, callable 2017        
Debt Instrument [Line Items]        
Subordinated debt securities     $ 292,947,000 $ 295,833,000
Stated interest rate (as a percent)     6.25% 6.25%
Successor | 6.00% Subordinated Debentures (2012), due 2042, callable 2017        
Debt Instrument [Line Items]        
Subordinated debt securities     $ 152,076,000 $ 152,930,000
Stated interest rate (as a percent)     6.00% 6.00%
Successor | 6.125% Subordinated Debentures (2004), due 2034, callable 2009        
Debt Instrument [Line Items]        
Repayment of debt       $ 103,100,000
Successor | Credit Facility        
Debt Instrument [Line Items]        
Debt     $ 360,000,000 $ 485,000,000
Successor | 2015 Credit Facility        
Debt Instrument [Line Items]        
Line of credit, amount outstanding     $ 360,000,000  
Prime Rate | 2015 Credit Facility        
Debt Instrument [Line Items]        
Base of floating rate interest rate payments   Prime rate    
Federal Funds Rate | 2015 Credit Facility        
Debt Instrument [Line Items]        
Base of floating rate interest rate payments   Funds rate    
Interest rate added to the base rate (as a percent)   0.50%    
LIBOR One-Month Rate | 2015 Credit Facility        
Debt Instrument [Line Items]        
Base of floating rate interest rate payments   one-month LIBOR    
Interest rate added to the base rate (as a percent)   1.00%    
LIBOR | Successor | 2015 Credit Facility        
Debt Instrument [Line Items]        
Base of floating rate interest rate payments     LIBOR  
Interest rate added to the base rate (as a percent)     1.00%  
PLICO | Successor | Letter of Credit        
Debt Instrument [Line Items]        
Outstanding letters of credit (LOC)     $ 30,000,000