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Segment Information (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Reconciliation of operating results by reportable segment

The following table presents operating results by reportable segment for the years ended:

	December 31, 2016												December 31, 2015												December 31, 2014
	Property & Casualty Lines				Other				Total				Property & Casualty Lines				Other				Total				Property & Casualty Lines				Other				Total
(Amounts in millions)
Net premiums earned	$	3,089.9			$	41.9			$	3,131.8			$	2,906.6			$	51.3			$	2,957.9			$	2,737.3			$	58.9			$	2,796.2
Less:
Losses and loss adjustment expenses	2,333.2				21.9				2,355.1				2,117.3				28.2				2,145.5				1,951.4				34.7				1,986.1
Underwriting expenses	780.4				17.5				797.9				770.0				20.0				790.0				749.7				25.9				775.6
Underwriting (loss) gain	(23.7		)		2.5				(21.2		)		19.3				3.1				22.4				36.2				(1.7		)		34.5
Investment income									121.9												126.3												125.7
Net realized investment (losses) gains									(34.3		)										(83.8		)										81.2
Other income									8.3												8.9												8.7
Interest expense									(4.0		)										(3.2		)										(2.6		)
Pre-tax income									$	70.7											$	70.6											$	247.4
Net income									$	73.0											$	74.5											$	177.9

Schedule direct premiums attributable to segment

The following table presents the Company’s net premiums earned and direct premiums written by line of insurance business for the years ended:

	December 31, 2016												December 31, 2015												December 31, 2014
	Property & Casualty Lines				Other				Total				Property & Casualty Lines				Other				Total				Property & Casualty Lines				Other				Total
(Amounts in millions)
Private passenger automobile	$	2,435.7			$	—			$	2,435.7			$	2,308.6			$	—			$	2,308.6			$	2,203.0			$	—			$	2,203.0
Homeowners	414.0				—				414.0				379.7				—				379.7				347.9				—				347.9
Commercial automobile	161.3				—				161.3				144.4				—				144.4				121.8				—				121.8
Other	78.9				41.9				120.8				73.9				51.3				125.2				64.6				58.9				123.5
Net premiums earned	$	3,089.9			$	41.9			$	3,131.8			$	2,906.6			$	51.3			2,957.9				$	2,737.3			$	58.9			$	2,796.2
Private passenger automobile	$	2,452.7			$	—			$	2,452.7			$	2,345.8			$	—			$	2,345.8			$	2,223.1			$	—			$	2,223.1
Homeowners	436.9				—				436.9				402.2				—				402.2				374.5				—				374.5
Commercial automobile	166.1				—				166.1				153.5				—				153.5				135.9				—				135.9
Other	89.0				27.3				116.3				81.6				29.8				111.4				75.4				44.3				119.7
Direct premiums written	$	3,144.7			$	27.3			$	3,172.0			$	2,983.1			$	29.8			$	3,012.9			$	2,808.9			$	44.3			$	2,853.2

X

- Definition

Disclosure of direct premium written by line of business.

+ References

No definition available.

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- Definition

Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

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