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INVESTMENTS (Details - Pledged Investments) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Investment [Line Items]    
Fair value of securities collateral pledged $ 1,324.0 $ 2,227.0
Fair value of amount sold or repledged 164.0 46.0
Total carrying values of cash and securities deposited under requirements of regulatory authorities or other insurance-related arrangements 7,900.0 4,900.0
Securities Lending Agreements, Fair Value of Collateral 1,057.0 2,915.0
Short-term investments held in escrow 155.0 255.0
Overnight and continuous    
Investment [Line Items]    
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Up to 30 Days    
Investment [Line Items]    
Securities Lending Agreements, Fair Value of Collateral 378.0 588.0
31 to 90 Days    
Investment [Line Items]    
Securities Lending Agreements, Fair Value of Collateral 549.0 2,327.0
91 to 364 Days    
Investment [Line Items]    
Securities Lending Agreements, Fair Value of Collateral 130.0 0.0
365 Days or Greater    
Investment [Line Items]    
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
FHLBs    
Investment [Line Items]    
Fair value of fixed maturities securities available for sale 4,200.0 2,700.0
Amount owned by subsidiaries 205.0 93.0
Residential loans pledged as collateral 2,000.0 471.0
Secured financing    
Investment [Line Items]    
Amounts Borrowed Under Repurchase and Securities Lending Agreements 1,500.0 4,500.0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 326.0 1,581.0
Amounts Loaned under Reverse Repurchase Agreements 1,300.0 2,200.0
Secured financing | Fixed maturity securities    
Investment [Line Items]    
Fair value of fixed maturities securities available for sale 1,247.0 2,911.0
Fair Value of other bond securities 136.0 1,585.0
Secured financing | Overnight and continuous    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 24.0 44.0
Secured financing | Up to 30 Days    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 247.0 407.0
Secured financing | 31 to 90 Days    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 55.0 1,130.0
Secured financing | 91 to 364 Days    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Secured financing | 365 Days or Greater    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Secured financing | Bonds available for sale | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 79.0 26.0
Securities Lending Agreements, Fair Value of Collateral 104.0 18.0
Secured financing | Bonds available for sale | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 111.0 48.0
Securities Lending Agreements, Fair Value of Collateral 953.0 2,819.0
Secured financing | Bonds available for sale | Overnight and continuous | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Bonds available for sale | Overnight and continuous | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Bonds available for sale | Up to 30 Days | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 79.0 7.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Bonds available for sale | Up to 30 Days | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 110.0 13.0
Securities Lending Agreements, Fair Value of Collateral 378.0 588.0
Secured financing | Bonds available for sale | 31 to 90 Days | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 19.0
Securities Lending Agreements, Fair Value of Collateral 82.0 18.0
Secured financing | Bonds available for sale | 31 to 90 Days | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 1.0 35.0
Securities Lending Agreements, Fair Value of Collateral 467.0 2,231.0
Secured financing | Bonds available for sale | 91 to 364 Days | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 22.0 0.0
Secured financing | Bonds available for sale | 91 to 364 Days | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 108.0 0.0
Secured financing | Bonds available for sale | 365 Days or Greater | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Bonds available for sale | 365 Days or Greater | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 3.0 11.0
Securities Lending Agreements, Fair Value of Collateral 0.0 22.0
Secured financing | Other bond securities | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 109.0 1,452.0
Securities Lending Agreements, Fair Value of Collateral 0.0 56.0
Secured financing | Other bond securities | U.S. government and government sponsored entities    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 24.0 44.0
Secured financing | Other bond securities | Overnight and continuous | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | Overnight and continuous | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | Overnight and continuous | U.S. government and government sponsored entities    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 24.0 44.0
Secured financing | Other bond securities | Up to 30 Days | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 3.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | Up to 30 Days | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 55.0 387.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | Up to 30 Days | U.S. government and government sponsored entities    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | 31 to 90 Days | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 11.0
Securities Lending Agreements, Fair Value of Collateral 0.0 22.0
Secured financing | Other bond securities | 31 to 90 Days | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 54.0 1,065.0
Securities Lending Agreements, Fair Value of Collateral 0.0 56.0
Secured financing | Other bond securities | 31 to 90 Days | U.S. government and government sponsored entities    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | 91 to 364 Days | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | 91 to 364 Days | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | 91 to 364 Days | U.S. government and government sponsored entities    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | 365 Days or Greater | Non-U.S. governments    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | 365 Days or Greater | Corporate debt    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
Securities Lending Agreements, Fair Value of Collateral 0.0 0.0
Secured financing | Other bond securities | 365 Days or Greater | U.S. government and government sponsored entities    
Investment [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 0.0 0.0
GIAs    
Investment [Line Items]    
Fair Value of other bond securities $ 1,700.0 $ 2,000.0