Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Fixed maturities, available-for-sale, at fair value (amortized cost $1,815.5 and $1,804.0, respectively)	$ 1,867.0	$ 1,830.1
Equity securities, available-for-sale, at fair value (cost $231.4 and $196.6, respectively)	297.1	265.3
Other invested assets, available-for-sale, at fair value (cost $50.4 and $49.5, respectively)	83.4	80.9
Other invested assets	5.3	5.0
Notes receivable from affiliate	70.0	70.0
Total investments	2,322.8	2,251.3
Cash and cash equivalents	82.2	80.3
Accrued investment income and other assets	33.3	33.6
Deferred policy acquisition costs	109.4	96.8
Reinsurance recoverable on losses and loss expenses payable	9.1	9.1
Prepaid reinsurance premiums	6.0	4.7
Due from affiliate	11.4	0
Current federal income taxes	0	0.3
Net deferred federal income taxes	3.7	11.9
Property and equipment, at cost	8.2	8.4
Total assets	2,586.1	2,496.4
Liabilities and Stockholders’ Equity
Losses and loss expenses payable (affiliates $443.3 and $438.0, respectively)	961.3	959.9
Unearned premiums (affiliates $103.0 and $78.4, respectively)	528.8	491.0
Notes payable (affiliates $15.5 and $15.5, respectively)	100.8	100.8
Postretirement and pension benefits	63.9	71.6
Due to affiliate	0	1.3
Current federal income taxes	0.7	0
Other liabilities	96.1	86.8
Total liabilities	1,751.6	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	141.6	137.5
Accumulated other comprehensive income	96.2	80.8
Retained earnings	593.5	563.8
Total stockholders’ equity	834.5	785.0
Total liabilities and stockholders’ equity	2,586.1	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