Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Fixed maturities, available-for-sale, at fair value (amortized cost $1,789.2 and $1,804.0, respectively)	$ 1,849.3	$ 1,830.1
Equity securities, available-for-sale, at fair value (cost $230.0 and $196.6, respectively)	300.4	265.3
Other invested assets, available-for-sale, at fair value (cost $49.7 and $49.5, respectively)	87.3	80.9
Other invested assets	5.3	5.0
Notes receivable from affiliate	70.0	70.0
Total investments	2,312.3	2,251.3
Cash and cash equivalents	71.5	80.3
Accrued investment income and other assets	33.4	33.6
Deferred policy acquisition costs	107.0	96.8
Reinsurance recoverable on losses and loss expenses payable	8.6	9.1
Prepaid reinsurance premiums	5.4	4.7
Due from affiliate	27.0	0
Current federal income taxes	0.5	0.3
Net deferred federal income taxes	4.2	11.9
Property and equipment, at cost	8.2	8.4
Total assets	2,578.1	2,496.4
Liabilities and Stockholders’ Equity
Losses and loss expenses payable (affiliates $437.8 and $438.0, respectively)	962.8	959.9
Unearned premiums (affiliates $103.1 and $78.4, respectively)	521.5	491.0
Notes payable (affiliates $15.5 and $15.5, respectively)	100.8	100.8
Postretirement and pension benefits	69.5	71.6
Due to affiliate	0	1.3
Other liabilities	79.8	86.8
Total liabilities	1,734.4	1,711.4
Stockholders’ equity:
Common stock, without par value. Authorized 100.0 shares; 47.7 and 47.5 shares issued, respectively, at stated value of $2.50 per share	119.2	118.8
Treasury stock, 6.8 and 6.8 shares, respectively, at cost	(116.0)	(115.9)
Additional paid-in capital	140.5	137.5
Accumulated other comprehensive income	114.4	80.8
Retained earnings	585.6	563.8
Total stockholders’ equity	843.7	785.0
Total liabilities and stockholders’ equity	2,578.1	2,496.4
Class A Preferred Stock [Member]
Stockholders’ equity:
Preferred stock value	0	0
Class B Preferred Stock [Member]
Stockholders’ equity:
Preferred stock value	$ 0	$ 0