Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Investments:
Fixed maturities available-for-sale, at fair value (cost: 2020 - $3,847.0, 2019 - $3,605.0; allowance for expected credit losses: 2020 - $33.7)		$ 3,914.4	$ 3,633.5	[1]
Equity securities, at fair value (cost: 2020 - $160.6; 2019 - $122.8)		150.7	124.4	[1]
Other investments (cost: 2020 - $412.1; 2019 - $482.5)		412.2	496.5	[1]
Short-term investments, at fair value (cost: 2020 - $528.5; 2019 - $844.8)		528.7	845.0	[1]
Total investments		5,006.0	5,099.4	[1]
Cash		300.4	137.8	[1]
Accrued investment income		22.2	25.7	[1]
Premiums receivable		797.0	688.2	[1]
Reinsurance recoverables		3,046.5	3,104.6	[1]
Goodwill		156.5	161.4	[1]
Intangible assets, net of accumulated amortization		90.8	91.8	[1]
Current income taxes receivable, net	[1]		0.0
Deferred tax asset, net		17.0	6.1	[1]
Deferred acquisition costs, net		170.4	160.2	[1]
Ceded unearned premiums		660.9	545.0	[1]
Operating lease right-of-use assets		84.4	91.8	[1]
Other assets		358.5	387.1	[1]
Assets held for sale		12.5	15.4	[1]
Total assets		10,734.3	10,514.5	[1]
Liabilities and Shareholders' Equity
Reserves for losses and loss adjustment expenses		5,390.0	5,157.6	[1]
Unearned premiums		1,574.2	1,410.9	[1]
Accrued underwriting expenses and other liabilities		202.8	226.0	[1]
Ceded reinsurance payable, net		1,085.0	1,203.1	[1]
Funds held		62.6	50.6	[1]
Senior unsecured fixed rate notes		140.1	140.0	[1]
Other indebtedness		59.1	181.3	[1]
Junior subordinated debentures		257.7	257.4	[1]
Current income taxes payable, net		0.0	0.8	[1]
Operating lease liabilities		98.3	105.7	[1]
Total liabilities		8,869.8	8,733.4	[1]
Commitments and contingencies (Note 14)				[1]
Shareholders' equity:
Preferred shares and additional paid-in capital - $1.00 par, 30,000,000 shares authorized; 6,000 and 0 shares issued at September 30, 2020 and December 31, 2019, respectively; liquidation preference $25,000		144.0	0.0	[1]
Common shares - $1.00 par, 500,000,000 shares authorized; 45,985,685 and 45,698,470 shares issued at September 30, 2020 and December 31, 2019, respectively		46.0	45.7	[1]
Additional paid-in capital		1,378.5	1,376.6	[1]
Treasury shares (11,315,889 shares at September 30, 2020 and December 31, 2019, respectively)		(455.1)	(455.1)	[1]
Retained earnings		714.2	811.1	[1]
Accumulated other comprehensive income, net of taxes		36.9	2.8	[1]
Total shareholders' equity		1,864.5	1,781.1	[1]
Total liabilities and shareholders' equity		$ 10,734.3	$ 10,514.5	[1]

[1] Derived from audited consolidated financial statements.