Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 3.0	$ 24.7
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, net	4.4	5.5
Share-based compensation	1.4	1.0
Net realized gains on investments	(1.3)	(3.8)
Changes in operating assets and liabilities:
Deferred policy acquisition costs (benefits)	1.6	(0.9)
Accrued investment income and other assets	(3.7)	(2.0)
Postretirement and pension benefits	(1.8)	(0.7)
Other liabilities and due to/from affiliates, net	4.9	(49.6)
Reinsurance recoverable on losses and loss expenses payable and prepaid reinsurance premiums	(0.1)	1.6
Losses and loss expenses payable	30.5	14.5
Unearned premiums	(15.5)	(8.2)
Federal income taxes	1.1	9.0
Cash provided from December 31, 2014 unearned premium transfer related to the homeowners quota share arrangement	0.0	63.5
Net cash provided by operating activities	24.5	54.6
Cash flows from investing activities:
Purchases of fixed maturities available-for-sale	(160.6)	(212.8)
Purchases of equity securities available-for-sale	(30.8)	(19.7)
Purchases of other invested assets	(0.4)	(3.9)
Maturities, calls and pay downs of fixed maturities available-for-sale	60.8	83.2
Sales of fixed maturities available-for-sale	75.8	62.5
Sales of equity securities available-for-sale	23.6	21.5
Sales of other invested assets available-for-sale	0.2	0.2
Net cash used in investing activities	(31.4)	(69.0)
Cash flows from financing activities:
Proceeds from issuance of common stock	0.8	0.7
Payments to acquire treasury stock	(0.2)	(0.1)
Payment of dividends	(4.1)	(4.1)
Net cash used in financing activities	(3.5)	(3.5)
Net decrease in cash and cash equivalents	(10.4)	(17.9)
Cash and cash equivalents at beginning of period	58.1	86.3
Cash and cash equivalents at end of period	47.7	68.4
Supplemental disclosures:
Interest paid (affiliates $0.2 and $0.2, respectively)	$ 1.3	$ 1.3