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FAIR VALUE MEASUREMENTS - BALANCE SHEET RECURRING (Details) - Significant unobservable inputs  (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Corporate securities
Assets:
Beginning balance	$ 136.2	$ 124.0	$ 127.8	$ 89.7
Purchases, sales, issuances and settlements, net	6.3	2.7	9.1	13.0
Total realized and unrealized gains (losses) included in net income	(12.8)	(0.9)	(1.7)	(0.1)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)	2.9	(13.4)	(6.9)	(41.7)
Transfers into level 3	1.6	9.7	5.9	68.6
Transfers out of level 3	(6.4)	0.0	(6.4)	(7.4)
Ending balance	127.8	122.1	127.8	122.1
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date	(12.8)	(0.9)	(1.7)	0.4
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date	2.1	(14.2)	(9.2)	(43.1)
Corporate securities | Investments held by variable interest entities - corporate securities
Assets:
Beginning balance				2.2
Purchases, sales, issuances and settlements, net				(2.1)
Total realized and unrealized gains (losses) included in net income				(0.1)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)				0.0
Transfers into level 3				0.0
Transfers out of level 3				0.0
Ending balance		0.0		0.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date				0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date				0.0
Asset-backed securities
Assets:
Beginning balance	39.8	29.7	57.0	26.6
Purchases, sales, issuances and settlements, net	1.1	18.3	(3.9)	26.0
Total realized and unrealized gains (losses) included in net income	0.0	0.0	(0.2)	0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)	0.6	(3.2)	(1.0)	(6.4)
Transfers into level 3	0.0	4.1	0.0	2.7
Transfers out of level 3	0.0	0.0	(10.4)	0.0
Ending balance	41.5	48.9	41.5	48.9
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date	0.0	0.0	0.0	0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date	0.6	(3.2)	(1.1)	(6.4)
Non-agency residential mortgage-backed securities
Assets:
Beginning balance	6.0	40.5	56.2	0.0
Purchases, sales, issuances and settlements, net	0.0	(0.1)	(0.1)	6.0
Total realized and unrealized gains (losses) included in net income	0.0	0.0	0.0	0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)	0.1	(2.5)	0.2	(10.3)
Transfers into level 3	2.5	13.6	0.0	33.4
Transfers out of level 3	(6.0)	(22.4)	(53.7)	0.0
Ending balance	2.6	29.1	2.6	29.1
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date	0.0	0.0	0.0	0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date	0.1	(2.5)	0.2	(10.3)
Collateralized loan obligations
Assets:
Beginning balance		4.4	3.4	5.0
Purchases, sales, issuances and settlements, net		0.0	0.0	0.0
Total realized and unrealized gains (losses) included in net income		0.0	0.0	0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)		0.0	0.0	(0.4)
Transfers into level 3		13.4	0.0	13.8
Transfers out of level 3		(4.4)	(3.4)	(5.0)
Ending balance	0.0	13.4	0.0	13.4
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date		0.0	0.0	0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date		0.0	0.0	(0.4)
Commercial mortgage-backed securities
Assets:
Beginning balance	12.4	16.5	14.5	19.0
Purchases, sales, issuances and settlements, net	0.0	0.0	0.0	28.0
Total realized and unrealized gains (losses) included in net income	0.0	0.0	0.0	0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)	(0.1)	(1.1)	(2.2)	(9.4)
Transfers into level 3	0.0	22.2	0.0	0.0
Transfers out of level 3	0.0	0.0	0.0	0.0
Ending balance	12.3	37.6	12.3	37.6
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date	0.0	0.0	0.0	0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date	(0.1)	(1.1)	(2.2)	(9.5)
Total fixed maturities, available for sale
Assets:
Beginning balance	194.4	215.1	258.9	140.3
Purchases, sales, issuances and settlements, net	7.4	20.9	5.1	73.0
Total realized and unrealized gains (losses) included in net income	(12.8)	(0.9)	(1.9)	(0.1)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)	3.5	(20.2)	(9.9)	(68.2)
Transfers into level 3	4.1	63.0	5.9	118.5
Transfers out of level 3	(12.4)	(26.8)	(73.9)	(12.4)
Ending balance	184.2	251.1	184.2	251.1
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date	(12.8)	(0.9)	(1.7)	0.4
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date	2.7	(21.0)	(12.3)	(69.7)
Equity securities - corporate securities
Assets:
Beginning balance	72.8	8.2	75.7	11.5
Purchases, sales, issuances and settlements, net	0.0	0.0	(2.1)	63.9
Total realized and unrealized gains (losses) included in net income	(0.2)	(0.5)	(1.0)	(0.6)
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)	0.0	0.0	0.0	0.0
Transfers into level 3	0.0	67.1	0.0	0.0
Transfers out of level 3	0.0	0.0	0.0	0.0
Ending balance	72.6	74.8	72.6	74.8
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date	(0.2)	(0.5)	(0.5)	(0.5)
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date	0.0	0.0	0.0	0.0
Trading Securities - Non-agency residential mortgage-backed securities
Assets:
Beginning balance		3.4	0.5	3.5
Purchases, sales, issuances and settlements, net		0.0	0.0	0.0
Total realized and unrealized gains (losses) included in net income		0.0	0.0	0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)		0.0	0.0	0.0
Transfers into level 3		0.0	0.0	0.0
Transfers out of level 3		(3.4)	(0.5)	(3.5)
Ending balance	0.0	0.0	0.0	0.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date		0.0	0.0	0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date		0.0	0.0	0.0
Trading Securities - Commercial mortgage-backed securities
Assets:
Beginning balance		6.0		12.9
Purchases, sales, issuances and settlements, net		0.0		0.0
Total realized and unrealized gains (losses) included in net income		0.0		0.0
Total 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		(6.0)		(12.9)
Ending balance		0.0		0.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date		0.0		0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date		0.0		0.0
Total trading securities
Assets:
Beginning balance		9.4		16.4
Purchases, sales, issuances and settlements, net		0.0		0.0
Total realized and unrealized gains (losses) included in net income		0.0		0.0
Total 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		(9.4)		(16.4)
Ending balance		0.0		0.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date		0.0		0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date		0.0		0.0
Other invested assets - residual tranches
Assets:
Beginning balance	7.5	2.6	18.3	0.0
Purchases, sales, issuances and settlements, net	3.9	1.6	6.1	2.8
Total realized and unrealized gains (losses) included in net income	0.0	(0.5)	0.4	0.0
Total realized and unrealized gains (losses) included in accumulated other comprehensive income (loss)	0.0	0.0	0.0	(0.6)
Transfers into level 3	0.7	0.3	0.0	1.8
Transfers out of level 3	0.0	0.0	(12.7)	0.0
Ending balance	12.1	4.0	12.1	4.0
Amount of total gains (losses) included in our net income relating to assets still held as of the reporting date	0.0	(0.5)	0.4	0.0
Amount of total gains (losses) included in accumulated other comprehensive income (loss) relating to assets still held as of the reporting date	$ 0.0	$ 0.0	$ 0.0	$ (0.6)

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