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FAIR VALUE MEASUREMENTS - FAIR VALUE ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS, UNOBSERVABLE INPUT RECONCILIATION (Details) - Fair Value, Inputs, Level 3 - Fair value, Measurements, Recurring - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Corporate securities    
Assets:    
Beginning balance $ 159.3 $ 127.8
Purchases, sales, issuances and settlements, net 13.9 26.3
Realized and unrealized gains (losses) included in net income (2.6) (1.7)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) (3.5) 8.3
Transfers into level 3 0.0 9.2
Transfers out of level 3 (39.1) (10.6)
Ending balance 128.0 159.3
Gains (losses) included in net income relating to assets still held at year-end (0.1) (1.7)
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end (5.9) 5.1
Asset-backed securities    
Assets:    
Beginning balance 25.5 57.0
Purchases, sales, issuances and settlements, net (0.7) (6.3)
Realized and unrealized gains (losses) included in net income 0.0 (0.2)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 (1.7)
Transfers into level 3 0.0 0.0
Transfers out of level 3 (5.0) (23.3)
Ending balance 19.8 25.5
Gains (losses) included in net income relating to assets still held at year-end 0.0 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end (3.4) (1.9)
Non-agency residential mortgage-backed securities    
Assets:    
Beginning balance 0.0 56.2
Purchases, sales, issuances and settlements, net 0.0 0.0
Realized and unrealized gains (losses) included in net income 0.0 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 0.0
Transfers into level 3 0.0 0.0
Transfers out of level 3 0.0 (56.2)
Ending balance 0.0 0.0
Gains (losses) included in net income relating to assets still held at year-end 0.0 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end 0.0 0.0
Collateralized loan obligations    
Assets:    
Beginning balance 0.0 3.4
Purchases, sales, issuances and settlements, net 4.0 0.0
Realized and unrealized gains (losses) included in net income 0.0 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 0.0
Transfers into level 3 0.0 0.0
Transfers out of level 3 0.0 (3.4)
Ending balance 4.0 0.0
Gains (losses) included in net income relating to assets still held at year-end 0.0 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end 0.0 0.0
Commercial mortgage-backed securities    
Assets:    
Beginning balance 13.1 14.5
Purchases, sales, issuances and settlements, net 0.0 0.0
Realized and unrealized gains (losses) included in net income (1.6) 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.9 (1.4)
Transfers into level 3 4.8 0.0
Transfers out of level 3 (13.1) 0.0
Ending balance 4.1 13.1
Gains (losses) included in net income relating to assets still held at year-end (1.6) 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end 1.0 (1.5)
Total fixed maturities, available for sale    
Assets:    
Beginning balance 197.9 258.9
Purchases, sales, issuances and settlements, net 17.2 20.0
Realized and unrealized gains (losses) included in net income (4.2) (1.9)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) (2.6) 5.2
Transfers into level 3 4.8 9.2
Transfers out of level 3 (57.2) (93.5)
Ending balance 155.9 197.9
Gains (losses) included in net income relating to assets still held at year-end (1.7) (1.7)
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end (8.3) 1.7
Equity securities - corporate securities    
Assets:    
Beginning balance 72.7 75.7
Purchases, sales, issuances and settlements, net 0.0 (2.1)
Realized and unrealized gains (losses) included in net income 0.7 (0.9)
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 0.0
Transfers into level 3 0.0 0.0
Transfers out of level 3 0.0 0.0
Ending balance 73.4 72.7
Gains (losses) included in net income relating to assets still held at year-end 0.8 (0.5)
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end 0.0 0.0
Trading securities - non-agency residential mortgage-backed securities    
Assets:    
Beginning balance 0.0 0.5
Purchases, sales, issuances and settlements, net 0.0 0.0
Realized and unrealized gains (losses) included in net income 0.0 0.0
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 0.0
Transfers into level 3 0.0 0.0
Transfers out of level 3 0.0 (0.5)
Ending balance 0.0 0.0
Gains (losses) included in net income relating to assets still held at year-end 0.0 0.0
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end 0.0 0.0
Other invested assets - residual tranches    
Assets:    
Beginning balance 31.5 18.3
Purchases, sales, issuances and settlements, net 37.3 13.1
Realized and unrealized gains (losses) included in net income 19.1 0.1
Realized and unrealized gains (losses) included in accumulated other comprehensive income (loss) 0.0 0.0
Transfers into level 3 7.5 0.0
Transfers out of level 3 0.0 0.0
Ending balance 95.4 31.5
Gains (losses) included in net income relating to assets still held at year-end 19.1 0.1
Gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held at year-end $ 0.0 $ 0.0