Consolidated Statements of Income - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Earned Premiums		$ 4,672.2	$ 4,472.4
Net Investment Income		348.2	364.3
Other Income		94.6	35.5
Income (Loss) from Change in Fair Value of Equity and Convertible Securities		72.1	138.9
Net Realized Gains on Sales of Investments		38.1	41.9
Other-than-temporary Impairment Losses:
Impairment Losses		(19.5)	(13.8)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent	$ 0.0	0.0	0.1
Total Revenues		5,205.7	5,039.2
Expenses:
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses		3,323.6	3,188.3
Insurance Expenses		1,100.5	1,019.7
Loss from Early Extinguishment of Debt		0.0	5.8
Interest and Other Expenses		271.5	163.8
Total Expenses		4,695.6	4,377.6
Income from Continuing Operations before Income Taxes		510.1	661.6
Income Tax Expense		(100.2)	(130.5)
Income from Continuing Operations	$ 188.4	409.9	531.1
Income from Discontinued Operations		0.0	0.0
Net Income		$ 409.9	$ 531.1
Income from Continuing Operations Per Unrestricted Share:
Basic (in dollars per share)	$ 3.22	$ 6.24	$ 8.04
Diluted (in dollars per share)	$ 3.19	6.14	7.96
Net Income Per Unrestricted Share:
Basic (in dollars per share)		6.24	8.04
Diluted (in dollars per share)		$ 6.14	$ 7.96