Consolidated Statements of Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues
Net earned premiums	$ 2,444.6	$ 2,343.0	$ 4,821.1	$ 4,608.5
Fees and other income	375.2	295.7	760.9	578.4
Net investment income	124.7	112.9	251.4	218.1
Net realized losses on investments (including $3.8, $3.1, $11.8 and $5.6 of impairment-related losses for the three and six months ended June 30, 2024 and 2023, respectively) and fair value changes to equity securities	(19.6)	(20.0)	(28.4)	(30.6)
Total revenues	2,924.9	2,731.6	5,805.0	5,374.4
Benefits, losses and expenses
Policyholder benefits	696.1	632.5	1,319.2	1,278.1
Underwriting, selling, general and administrative expenses	1,969.2	1,867.6	3,906.5	3,690.8
Interest expense	26.7	27.2	53.5	54.2
Gain on extinguishment of debt	0.0	0.0	0.0	(0.1)
Total benefits, losses and expenses	2,692.0	2,527.3	5,279.2	5,023.0
Income before income tax expense	232.9	204.3	525.8	351.4
Income tax expense	44.2	48.0	100.7	81.5
Net income	$ 188.7	$ 156.3	$ 425.1	$ 269.9
Earnings Per Common Share
Basic (in dollars per share)	$ 3.59	$ 2.91	$ 8.09	$ 5.03
Diluted (in dollars per share)	$ 3.58	$ 2.90	$ 8.05	$ 5.01
Share Data
Weighted average common shares outstanding used in basic per common share calculations (in shares)	52,500,727	53,745,611	52,516,296	53,619,711
Plus: Dilutive securities (in shares)	217,009	144,071	298,660	223,324
Weighted average common shares outstanding used in diluted per common share calculations (in shares)	52,717,736	53,889,682	52,814,956	53,843,035