Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Assets
Fixed maturities, available-for-sale, at fair value (amortized cost $1,991.5 and $1,972.9, respectively)	$ 2,055.5	$ 2,000.7
Equity securities, available-for-sale, at fair value (cost $274.5 and $265.2, respectively)	318.9	310.6
Other invested assets, available-for-sale, at fair value (cost $57.1 and $56.9, respectively)	85.8	85.1
Other invested assets	5.3	5.3
Notes receivable from affiliate	70.0	70.0
Total investments	2,535.5	2,471.7
Cash and cash equivalents	47.7	58.1
Accrued investment income and other assets	39.3	35.7
Deferred policy acquisition costs (affiliated net assumed $50.2 and $49.3, respectively)	127.5	129.1
Reinsurance recoverable on losses and loss expenses payable	6.5	5.9
Prepaid reinsurance premiums	6.3	6.8
Due from affiliate	4.3	5.9
Current federal income taxes	4.9	4.9
Net deferred federal income taxes	89.0	102.5
Property and equipment, at cost	7.5	7.6
Total assets	2,868.5	2,828.2
Liabilities and Stockholders’ Equity
Losses and loss expenses payable (affiliated net assumed $554.3 and $532.4, respectively)	1,083.5	1,053.0
Unearned premiums (affiliated net assumed $212.1 and $214.2, respectively)	600.8	616.3
Notes payable (affiliates $15.2 and $15.2, respectively)	100.5	100.5
Postretirement and pension benefits (affiliated net ceded $54.6 and $56.0, respectively)	101.5	104.0
Other liabilities (affiliated net assumed $7.1 and affiliated net ceded $8.4, respectively)	73.3	69.8
Total liabilities	1,959.6	1,943.6
Stockholders’ equity:
Common stock, without par value. Authorized 100.0 shares; 48.2 and 48.1 shares issued, respectively, at stated value of $2.50 per share	120.6	120.4
Treasury stock, 6.8 and 6.8 shares, respectively, at cost	(116.5)	(116.3)
Additional paid-in capital	155.1	153.5
Accumulated other comprehensive income (affiliated net ceded $55.6 and $56.7, respectively)	61.4	37.6
Retained earnings	688.3	689.4
Total stockholders’ equity	908.9	884.6
Total liabilities and stockholders’ equity	2,868.5	2,828.2
Class A Preferred Stock [Member]
Stockholders’ equity:
Preferred stock value	0.0	0.0
Class B Preferred Stock [Member]
Stockholders’ equity:
Preferred stock value	$ 0.0	$ 0.0