Unaudited Condensed Consolidated Statements Of Operations And Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUES:
Gross premiums written	$ 730.2	$ 754.1	$ 2,394.1	$ 2,460.6
Premiums ceded	(201.9)	(147.1)	(583.6)	(477.4)
Net premiums written	528.3	607.0	1,810.5	1,983.2
Change in unearned premiums	55.7	43.7	(43.4)	(117.6)
Net premiums earned	584.0	650.7	1,767.1	1,865.6
Net investment income	50.6	45.7	159.7	133.0
Net realized investment gains (losses)	10.7	(113.6)	104.0	(88.8)
Other income	1.8	0.7	7.6	2.5
Total revenues	647.1	583.5	2,038.4	1,912.3
EXPENSES:
Net losses and loss expenses	376.3	416.9	1,114.1	1,173.6
Acquisition costs	82.0	100.1	257.7	279.4
General and administrative expenses	104.2	105.8	305.3	311.3
Other expense	2.2	1.3	5.0	4.3
Amortization of intangible assets	2.5	2.6	7.5	6.1
Interest expense	13.5	14.5	53.3	43.2
Foreign exchange loss (gain)	1.0	(0.8)	(4.9)	10.4
Total expenses	581.7	640.4	1,738.0	1,828.3
Income (loss) before income taxes	65.4	(56.9)	300.4	84.0
Income tax (benefit) expense	(3.2)	(5.3)	4.3	1.8
NET INCOME (LOSS)	68.6	(51.6)	296.1	82.2
Other comprehensive gain (loss): foreign currency translation adjustment	0.6	(1.0)	3.9	(4.3)
COMPREHENSIVE INCOME (LOSS)	$ 69.2	$ (52.6)	$ 300.0	$ 77.9
PER SHARE DATA
Basic earnings (loss) per share	$ 0.79	$ (0.57)	$ 3.34	$ 0.88
Diluted earnings (loss) per share	$ 0.77	$ (0.57)	$ 3.29	$ 0.87
Weighted average common shares outstanding	87,102,290	90,882,511	88,691,983	93,068,088
Weighted average common shares and common share equivalents outstanding	88,603,101	90,882,511	90,113,606	94,724,980
Dividends paid per share	$ 0.260	$ 0.260	$ 0.780	$ 0.710