Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 37.3	$ (4.1)
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization, net	6.7	9.9
Share-based compensation	6.7	3.0
Net investment gain	(18.2)	43.8
Changes in operating assets and liabilities:
Deferred policy acquisition costs	5.8	7.2
Accrued investment income and other assets	(3.0)	2.0
Postretirement and pension benefits	(10.6)	(9.1)
Other liabilities and due to/from affiliates, net	11.8	15.1
Reinsurance recoverable on losses and loss expenses payable and prepaid reinsurance premiums	(2.3)	1.9
Losses and loss expenses payable	(56.9)	98.9
Unearned premiums	(16.2)	12.7
Excess Tax Benefit from Share-based Compensation, Operating Activities	0.0	1.3
Federal income taxes	8.6	(0.3)
Net cash (used in) provided by operating activities	(30.3)	60.7
Cash flows from investing activities:
Purchases of fixed maturities available-for-sale	(267.0)	(409.2)
Purchases of equity securities	(82.2)	(104.1)
Purchases of other invested assets	(1.1)	(1.0)
Maturities, calls and pay downs of fixed maturities available-for-sale	180.4	192.1
Sales of fixed maturities available-for-sale	69.7	156.3
Sales of equity securities	89.3	171.3
Sales of other invested assets	0.9	0.8
Net cash (used in) provided by investing activities	(10.0)	6.2
Cash flows from financing activities:
Proceeds from issuance of common stock	11.7	6.0
Payments to acquire treasury stock	(0.2)	(0.2)
Payment of dividends	(12.8)	(12.7)
Payment for Debt Extinguishment or Debt Prepayment Cost	(0.4)	0.0
Net cash provided by (used in) financing activities	(1.7)	(6.9)
Net (decrease) increase in cash and cash equivalents	(42.0)	60.0
Cash and cash equivalents at beginning of period	91.5	51.1
Cash and cash equivalents at end of period	49.5	111.1
Supplemental disclosures:
Interest paid (affiliates $0.7 and $0.6, respectively)	$ 4.5	$ 4.3