Segment Information (Tables)

9 Months Ended

Sep. 30, 2011

Segment Information [Abstract]

Financial Information With Respect To Business Segments

	Three Months Ended September 30,						Nine Months Ended September 30,
(in millions)	2011			2010			2011			2010
Segment revenues:
Commercial Lines	$	449.4		$	397.2		$	1,336.6		$	1,099.3
Personal Lines		389.9			397.1			1,164.8			1,190.3
Chaucer		257.5			—			257.5			—
Other Property and Casualty		4.2			5.1			15.6			15.9
Total		1,101.0			799.4			2,774.5			2,305.5
Intersegment revenues		(1.2	)		(1.1	)		(3.7	)		(3.4	)
Total segment revenues		1,099.8			798.3			2,770.8			2,302.1
Net realized investment gains		8.2			5.7			24.9			16.8
Total revenues	$	1,108.0		$	804.0		$	2,795.7		$	2,318.9
Segment income (loss) before income taxes:
Commercial Lines:
GAAP underwriting income (loss)	$	(56.7	)	$	2.3		$	(132.0	)	$	(22.5	)
Net investment income		34.0			32.3			101.6			96.6
Other income		0.6			0.5			2.0			0.7
Commercial Lines segment income (loss)		(22.1	)		35.1			(28.4	)		74.8
Personal Lines:
GAAP underwriting income (loss)		(28.9	)		15.2			(69.8	)		(8.7	)
Net investment income		22.7			25.4			68.5			76.6
Other income		1.4			2.4			3.7			6.1
Personal Lines segment income (loss)		(4.8	)		43.0			2.4			74.0
Chaucer:
GAAP underwriting income (loss)		12.1			—			12.1			—
Net investment income		8.6			—			8.6			—
Other net expenses		(0.8	)		—			(0.8	)		—
Chaucer segment income (loss)		19.9			—			19.9			—
Other Property and Casualty:
GAAP underwriting income (loss)		—			0.4			0.1			0.7
Net investment income		2.5			3.6			10.5			11.0
Other net expenses		(3.1	)		(2.9	)		(9.1	)		(9.0	)
Other Property and Casualty segment income (loss)		(0.6	)		1.1			1.5			2.7
Total		(7.6	)		79.2			(4.6	)		151.5
Interest expense on debt		(17.4	)		(11.8	)		(38.6	)		(32.8	)
Segment income (loss) before income taxes		(25.0	)		67.4			(43.2	)		118.7
Adjustments to segment income (loss):
Net realized investment gains		8.2			5.7			24.9			16.8
Net loss from retirement of debt		(0.1	)		—			(2.3	)		—
Costs related to acquired businesses		(1.9	)		—			(15.7	)		—
Loss on derivative instruments		(6.6	)		—			(11.3	)		—
Net foreign exchange gains		6.7			—			6.7			—
Income (loss) before income taxes	$	(18.7	)	$	73.1		$	(40.9	)	$	135.5

Financial Information With Respect To Business Segments And Discontinued Operations Related To Identifiable Assets

(in millions)	September 30, 2011		December 31, 2010
U.S. Companies	$	8,468.4	$	8,436.3
Chaucer		4,088.8		—
Discontinued operations		127.3		133.6
Total	$	12,684.5	$	8,569.9