Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Assets
Available-for-sale (cost: 2015 - $2,971.0; 2014 - $2,817.2)	$ 2,927,300,000	$ 2,840,700,000
Equity securities, at fair value (cost: 2015 - $349.7; 2014 - $324.8)	463,900,000	503,800,000
Other investments (cost: 2015 - $499.6; 2014 - $488.9)	513,700,000	495,100,000
Short-term investments, at fair value (cost: 2015 - $211.2; 2014 - $258.3)	210,800,000	258,300,000
Total investments	4,115,700,000	4,097,900,000
Cash	121,700,000	81,000,000
Accrued investment income	21,600,000	22,100,000
Premiums receivable	404,500,000	353,600,000
Reinsurance recoverables	1,121,100,000	997,200,000
Goodwill	152,200,000	152,200,000
Intangible assets, net of accumulated amortization	73,300,000	78,600,000
Current income taxes receivable, net	11,600,000	14,900,000
Deferred acquisition costs, net	132,400,000	124,600,000
Ceded unearned premiums	250,800,000	207,600,000
Other assets	225,200,000	226,600,000
Total assets	6,630,100,000	6,356,300,000
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	3,123,600,000	3,042,400,000
Unearned premiums	886,700,000	817,200,000
Accrued underwriting expenses	133,900,000	143,100,000
Ceded reinsurance payable, net	312,400,000	178,800,000
Funds held	77,600,000	55,000,000
Senior unsecured fixed rate notes	143,800,000	143,800,000
Other indebtedness	55,200,000	62,000,000
Junior subordinated debentures	172,700,000	172,700,000
Deferred tax liabilities, net	23,600,000	53,000,000
Other liabilities	32,500,000	41,600,000
Total liabilities	4,962,000,000	4,709,600,000
Commitments and contingencies (Note 16)	0	0
Shareholders' equity:
Common shares - $1.00 par, 500,000,000 shares authorized; 37,105,922 and 36,889,386 shares issued at December 31, 2015 and December 31, 2014, respectively	37,100,000	34,300,000
Additional paid-in capital	964,900,000	836,300,000
Treasury shares (9,181,644 and 8,606,489 shares at December 31, 2015 and December 31, 2014, respectively)	(331,100,000)	(301,400,000)
Retained earnings	985,700,000	969,400,000
Accumulated other comprehensive income, net of taxes	11,500,000	108,100,000
Total shareholders' equity	1,668,100,000	1,646,700,000
Total liabilities and shareholders' equity	$ 6,630,100,000	$ 6,356,300,000