Segment Information (Tables)

9 Months Ended

Sep. 30, 2016

Segment Information [Abstract]

Financial Information with Respect to Business Segments

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
(in millions)		2016		2015		2016		2015
Operating revenues:
Commercial Lines	$	628.4	$	601.2	$	1,857.2	$	1,786.7
Personal Lines		391.5		379.7		1,154.8		1,131.4
Chaucer		215.0		242.7		667.9		875.5
Other		2.1		1.9		5.9		5.7
Total		1,237.0		1,225.5		3,685.8		3,799.3
Net realized investment gains		4.2		8.0		5.0		30.0
Total revenues	$	1,241.2	$	1,233.5	$	3,690.8	$	3,829.3
Operating income (loss) before interest expense and income taxes:
Commercial Lines:
Underwriting income	$	3.6	$	8.3	$	12.4	$	10.9
Net investment income		39.0		38.7		117.5		116.7
Other (expenses) income		(0.1)		0.1		(0.7)		(1.1)
Commercial Lines operating income		42.5		47.1		129.2		126.5
Personal Lines:
Underwriting income		23.3		17.9		81.2		34.3
Net investment income		17.1		18.0		51.6		54.2
Other income		1.3		1.3		3.4		3.1
Personal Lines operating income		41.7		37.2		136.2		91.6
Chaucer:
Underwriting income		37.8		29.6		53.8		92.7
Net investment income		10.3		10.5		32.3		34.8
Other income		0.3		1.1		1.5		4.9
Chaucer operating income		48.4		41.2		87.6		132.4
Other:
Underwriting loss		(0.8)		(0.9)		(2.1)		(2.3)
Net investment income		1.4		1.1		3.8		3.4
Other net expenses		(3.4)		(3.1)		(9.8)		(9.1)
Other operating loss		(2.8)		(2.9)		(8.1)		(8.0)
Operating income before interest expense and income taxes		129.8		122.6		344.9		342.5
Interest on debt		(12.5)		(14.8)		(42.8)		(45.9)
Operating income before income taxes		117.3		107.8		302.1		296.6
Non-operating income items:
Net realized investment gains		4.2		8.0		5.0		30.0
Net gain on disposal of U.K. motor business		0.1		-		1.3		37.7
Net loss from repayment of debt		-		(5.6)		(86.1)		(24.1)
Other non-operating items		2.5		0.2		2.8		(0.2)
Income before income taxes	$	124.1	$	110.4	$	225.1	$	340.0

Identifiable Assets by Business Segment

	September 30, 2016		December 31, 2015
(in millions)	Identifiable Assets
U.S. Companies	$	10,124.7	$	9,616.0
Chaucer		4,155.0		4,082.2
Discontinued operations		84.0		83.0
Total	$	14,363.7	$	13,781.2