Segment Information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Reconciliation of operating results by reportable segment

The following table presents the Company's operating results by reportable segment:

	Three Months Ended
	March 31, 2017								March 31, 2016
	Property & Casualty Lines			Other		Total			Property & Casualty Lines			Other		Total
(Amounts in millions)
Net premiums earned	$	780.8		$	9.0	$	789.8		$	755.8		$	11.3	$	767.1
Less:
Losses and loss adjustment expenses	601.8			4.9		606.7			588.0			6.1		594.1
Underwriting expenses	203.8			4.0		207.8			197.9			4.9		202.8
Underwriting (loss) gain	(24.8		)	0.1		(24.7		)	(30.1		)	0.3		(29.8		)
Investment income						31.2								29.7
Net realized investment gains						24.5								25.0
Other income						2.1								2.1
Interest expense						(2.5		)						(1.0		)
Pre-tax income						$	30.6							$	26.0
Net income						$	27.0							$	23.3

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:

	Three Months Ended
	March 31, 2017						March 31, 2016
	Property & Casualty Lines		Other		Total		Property & Casualty Lines		Other		Total
(Amounts in millions)
Private passenger automobile	$	613.3	$	—	$	613.3	$	599.0	$	—	$	599.0
Homeowners	105.7		—		105.7		99.5		—		99.5
Commercial automobile	41.3		—		41.3		38.7		—		38.7
Other	20.5		9.0		29.5		18.6		11.3		29.9
Net premiums earned	$	780.8	$	9.0	$	789.8	$	755.8	$	11.3	$	767.1
Private passenger automobile	$	639.0	$	—	$	639.0	$	631.8	$	—	$	631.8
Homeowners	103.8		—		103.8		99.1		—		99.1
Commercial automobile	43.0		—		43.0		40.9		—		40.9
Other	22.7		5.7		28.4		20.9		7.4		28.3
Direct premiums written	$	808.5	$	5.7	$	814.2	$	792.7	$	7.4	$	800.1