Segment Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Financial Information with Respect to Business Segments

Summarized below is financial information with respect to the Company’s business segments.

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(in millions)	2018			2017			2018			2017
Operating revenues:
Commercial Lines	$	681.7		$	634.5		$	1,358.3		$	1,265.0
Personal Lines		444.5			411.5			879.4			813.3
Chaucer		228.8			211.2			468.2			435.9
Other		4.1			3.0			7.5			5.0
Total		1,359.1			1,260.2			2,713.4			2,519.2
Net realized and unrealized investment gains (losses)		3.7			5.9			(19.7	)		7.8
Total revenues	$	1,362.8		$	1,266.1		$	2,693.7		$	2,527.0
Operating income (loss) before interest expense and income taxes:
Commercial Lines:
Underwriting income (loss)	$	37.7		$	2.3		$	54.1		$	(0.4	)
Net investment income		44.8			41.3			90.1			81.6
Other expense		(0.5	)		(0.4	)		(0.7	)		(0.6	)
Commercial Lines operating income		82.0			43.2			143.5			80.6
Personal Lines:
Underwriting income		8.0			29.5			22.7			21.1
Net investment income		18.1			17.4			36.5			34.5
Other income		1.2			1.0			2.5			2.2
Personal Lines operating income		27.3			47.9			61.7			57.8
Chaucer:
Underwriting income		9.3			18.0			15.5			31.8
Net investment income		12.5			11.3			28.9			23.7
Other income (expense)		0.1			0.4			0.4			(0.9	)
Chaucer operating income		21.9			29.7			44.8			54.6
Other:
Underwriting loss		(1.4	)		(0.9	)		(2.7	)		(1.8	)
Net investment income		3.3			2.3			6.1			3.6
Other expense		(3.3	)		(3.3	)		(7.0	)		(6.8	)
Other operating (loss) gain		(1.4	)		(1.9	)		(3.6	)		5.0
Operating income before interest expense and income taxes		129.8			118.9			246.4			188.0
Interest on debt		(11.6	)		(12.2	)		(24.0	)		(24.2	)
Operating income before income taxes		118.2			106.7			222.4			163.8
Non-operating income items:
Net realized and unrealized investment gains (losses)		3.7			5.9			(19.7	)		7.8
Other non-operating items		(2.0	)		(1.6	)		(2.2	)		(1.6	)
Income before income taxes	$	119.9		$	111.0		$	200.5		$	170.0

Identifiable Assets by Business Segment

The following table provides identifiable assets for the Company’s business segments and discontinued operations:

	June 30, 2018		December 31, 2017
(in millions)	Identifiable Assets
U.S. Companies	$	11,049.8	$	10,909.2
Chaucer		4,251.2		4,472.4
Discontinued operations		102.6		88.0
Total	$	15,403.6	$	15,469.6