Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Net premiums earned	$ 1,353.1	$ 1,329.6	$ 2,729.8	$ 2,593.0
Title, escrow, and other fees	129.9	130.9	250.0	225.6
Total premiums and fees	1,483.1	1,460.5	2,979.9	2,818.6
Net investment income	108.7	113.0	222.9	225.1
Other income	32.0	34.1	66.7	64.5
Total operating revenues	1,623.9	1,607.7	3,269.6	3,108.3
Investment gains (losses):
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	(7.3)	12.5	11.2	24.9
Realized Investment Gains Losses From Impairment	0.0	(2.0)	0.0	(2.0)
Unrealized from changes in fair value of equity securities	354.0	26.3	(608.7)	382.0
Total realized and unrealized investment gains (losses)	346.7	36.9	(597.4)	405.0
Total revenues	1,970.6	1,644.7	2,672.2	3,513.4
Benefits, Claims and Expenses:
Benefits, claims and settlement expenses	617.8	629.9	1,237.5	1,228.4
Dividends to policyholders	6.2	5.3	9.1	12.9
Underwriting, acquisition, and other expenses	836.9	793.5	1,673.8	1,526.9
Interest and other charges	10.4	10.4	22.3	21.0
Total expenses	1,471.5	1,439.2	2,943.0	2,789.4
Income (loss) before income taxes (credits)	499.1	205.4	(270.8)	723.9
Income Taxes (Credits):
Current	25.9	30.6	65.9	74.3
Deferred	75.5	9.3	(129.7)	71.8
Total	101.4	39.9	(63.7)	146.1
Net Income (Loss)	$ 397.7	$ 165.5	$ (207.0)	$ 577.7
Net Income (Loss) Per Share:
Net income (loss) per share: Basic (in dollars per share)	$ 1.34	$ 0.55	$ (0.69)	$ 1.93
Net income (loss) per share: Diluted (in dollars per share)	$ 1.34	$ 0.55	$ (0.69)	$ 1.92
Average shares outstanding: Basic (in shares)	297,523,559	299,418,182	298,915,853	299,341,472
Average shares outstanding: Diluted (in shares)	297,776,315	300,752,992	298,915,853	300,580,764