Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (114.6)	$ 49.4
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization, net	1.6	3.1
Share-based compensation	0.5	3.8
Net investment loss (gain)	135.2	(44.9)
Changes in operating assets and liabilities:
Deferred policy acquisition costs	(2.2)	(2.4)
Accrued investment income and other assets	(1.5)	(4.1)
Postretirement and pension benefits	(0.9)	(0.1)
Other liabilities and due to/from affiliates, net	(26.2)	(33.6)
Reinsurance recoverable on losses and loss expenses payable and prepaid reinsurance premiums	(26.5)	0.8
Losses and loss expenses payable	19.5	(17.9)
Unearned premiums	16.5	3.3
Excess Tax Benefit from Share-based Compensation, Operating Activities	(0.2)	0.2
Federal income taxes	(29.2)	12.0
Net cash used in operating activities	(28.0)	(30.4)
Cash flows from investing activities:
Purchases of fixed maturities available-for-sale	(122.4)	(137.2)
Purchases of equity securities	(16.1)	(19.5)
Purchases of other invested assets	(6.6)	(1.0)
Maturities, calls and pay downs of fixed maturities available-for-sale	67.9	125.9
Sales of fixed maturities available-for-sale	83.5	65.6
Sales of equity securities	13.2	12.7
Sales of other invested assets	0.4	0.3
Proceeds from Sale of Property, Plant, and Equipment	0.2	0.0
Net cash provided by investing activities	20.1	46.8
Cash flows from financing activities:
Proceeds from issuance of common stock	1.8	1.0
Payments to acquire treasury stock	(0.9)	(0.5)
Payment of dividends	(4.4)	(4.4)
Proceeds from Short-term Debt	60.0	0.0
Net cash provided by (used in) financing activities	56.5	(3.9)
Net increase in cash and cash equivalents	48.6	12.5
Cash and cash equivalents at beginning of period	78.0	59.8
Cash and cash equivalents at end of period	126.6	72.3
Supplemental disclosures:
Interest Paid, Excluding Capitalized Interest, Operating Activities	$ 1.2	$ 1.7