Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments:
Fixed maturities available-for-sale, at fair value (cost: 2021 - $4,145.2, 2020 - $3,981.1; allowance for expected credit losses: 2021 - $7.0, 2020 - $6.6)	$ 4,197.3	$ 4,107.1
Equity securities, at fair value (cost: 2021 - $131.1; 2020 - $162.5)	181.8	176.7
Other investments (cost: 2021 - $425.8; 2020 - $429.4)	425.8	429.4
Short-term investments, at fair value (cost: 2021 - $507.8; 2020 - $541.4)	508.6	542.6
Total investments	5,313.5	5,255.8
Cash	202.0	148.8
Accrued investment income	20.9	21.8
Premiums receivable	701.9	679.8
Reinsurance recoverables	2,954.0	3,009.0
Goodwill	147.3	147.3
Intangible assets, net of accumulated amortization	60.5	60.5
Current income taxes receivable, net	3.8	3.0
Deferred tax asset, net	42.8	16.7
Deferred acquisition costs, net	175.7	163.6
Ceded unearned premiums	572.1	575.1
Operating lease right-of-use assets	87.7	82.0
Other assets	231.4	294.7
Assets held for sale	4.5	7.7
Total assets	10,518.1	10,465.8
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses	5,439.5	5,406.0
Unearned premiums	1,540.2	1,464.8
Accrued underwriting expenses and other liabilities	255.2	167.6
Ceded reinsurance payable, net	763.8	950.4
Funds held	74.2	64.7
Senior unsecured fixed rate notes	140.3	140.2
Other indebtedness	58.7	60.7
Junior subordinated debentures	258.1	257.8
Operating lease liabilities	100.5	95.8
Total liabilities	8,630.5	8,608.0
Commitments and contingencies (Note 14)
Shareholders' equity:
Preferred shares and additional paid-in capital - $1.00 par, 30,000,000 shares authorized; 6,000 shares issued at September 30, 2021 and December 31, 2020, respectively; liquidation preference $25,000	144.0	144.0
Common shares - $1.00 par, 500,000,000 shares authorized; 46,178,719 and 46,009,966 shares issued at September 30, 2021 and December 31, 2020, respectively	46.2	46.0
Additional paid-in capital	1,385.0	1,380.2
Treasury shares (11,315,889 shares at September 30, 2021 and December 31, 2020, respectively)	(455.1)	(455.1)
Retained earnings	765.5	684.1
Accumulated other comprehensive income, net of taxes	2.0	58.6
Total shareholders' equity	1,887.6	1,857.8
Total liabilities and shareholders' equity	$ 10,518.1	$ 10,465.8