Segment Information (Tables)

3 Months Ended

Mar. 31, 2012

Segment Information [Abstract]

Financial Information With Respect To Business Segments

	Three Months Ended March 31,
(in millions)	2012			2011
Segment revenues:
Commercial Lines	$	475.7		$	439.3
Personal Lines		388.4			386.7
Chaucer		251.7			—
Other Property and Casualty		4.5			5.8
Total		1,120.3			831.8
Intersegment revenues		(1.6	)		(1.3	)
Total segment revenues		1,118.7			830.5
Net realized investment gains		3.1			3.3
Total revenues	$	1,121.8		$	833.8
Segment income (loss) before income taxes:
Commercial Lines:
GAAP underwriting income (loss)	$	(2.5	)	$	(16.0	)
Net investment income		35.7			33.6
Other income		0.7			0.6
Commercial Lines segment income		33.9			18.2
Personal Lines:
GAAP underwriting income		4.2			6.4
Net investment income		21.6			22.7
Other income		1.7			1.2
Personal Lines segment income		27.5			30.3
Chaucer:
GAAP underwriting income		14.7			—
Net investment income		9.4			—
Other income		1.4			—
Chaucer segment income		25.5			—
Other Property and Casualty:
GAAP underwriting income (loss)		(0.4	)		0.1
Net investment income		2.1			4.1
Other net expenses		(2.9	)		(2.9	)
Other Property and Casualty segment income (loss)		(1.2	)		1.3
Total		85.7			49.8
Interest expense on debt		(16.2	)		(10.4	)
Segment income before income taxes		69.5			39.4
Adjustments to segment income (loss):
Net realized investment gains		3.1			3.3
Loss from retirement of debt		—			(2.5	)
Costs related to acquired businesses		(1.5	)		(2.7	)
Net foreign exchange losses		(0.3	)		—
Income before income taxes	$	70.8		$	37.5

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

(in millions)	March 31, 2012		December 31, 2011
U.S. Companies	$	8,484.7	$	8,471.6
Chaucer		4,302.2		4,005.8
Discontinued operations		126.5		121.2
Total	$	12,913.4	$	12,598.6