Deferred Policy Acquisition Cost (Tables)

12 Months Ended

Dec. 31, 2023

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Capitalization of Deferred Policy Acquisition Costs

Years Ended December 31:	2023		2022		2021
Deferred, beginning of year	$	382.5	$	350.4	$	328.0
Policy acquisition costs deferred:
Commissions - net of reinsurance	495.0		423.3		340.9
Premium taxes	161.0		147.1		135.2
Salaries and other underwriting expenses	59.3		53.0		48.3
Subtotal	715.3		623.5		524.6
Amortization charged to income	(680.1)		(591.4)		(502.2)
Change for the year	35.2		32.0		22.4
Deferred, end of year	$	417.8	$	382.5	$	350.4