AGENT DEFERRED COMPENSATION PLAN - NARRATIVE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Cost recognized for defined contribution plan	$ 10.3	$ 6.7	$ 6.0
Nonqualified Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation arrangement with individual, recorded liability	62.5	68.8
Company-owned life insurance	54.9	62.0
Deferred compensation arrangement contributions by employer	$ 6.3	6.0	4.9
Minimum | Nonqualified Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation arrangement vesting period	5 years
Maximum | Nonqualified Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation arrangement vesting period	10 years
Unfunded Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation arrangement with individual, recorded liability	$ 128.8	179.9
Net periodic benefit cost	(42.8)	(2.6)	22.8
Deferred compensation arrangement with individual, gain (loss) recognized	48.9	8.9	(16.3)
Company-owned life insurance	199.1	207.0
Change in value of corporate or bank owned life insurance	$ (4.4)	$ (2.7)	$ 15.7