Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Reconciliations of Statutory Capital and Surplus and Net Income

The following tables set forth reconciliations of statutory capital and surplus and net income, as determined using SAP, to the amounts included in the accompanying consolidated financial statements:

($ millions)	2017			2016
Statutory capital and surplus of insurance subsidiaries	$	858.4		$	844.4
Net liabilities of non-insurance parent and affiliates	(89.8		)	(84.9		)
	768.6			759.5
Increases (decreases):
Deferred acquisition costs	117.8			129.8
Postretirement and pension benefits	22.3			22.7
Deferred federal income taxes	(61.2		)	(49.1		)
Fixed maturities, at fair value	19.6			13.5
Other, net	13.8			14.9
Stockholders’ equity per accompanying consolidated financial statements	$	880.9		$	891.3

($ millions)	Year ended December 31
	2017			2016			2015
Statutory net income of insurance subsidiaries	$	42.8		$	22.7		$	65.4
Net loss of non-insurance parent and affiliates	(13.1		)	(3.0		)	(4.1		)
	29.7			19.7			61.3
Increases (decreases):
Deferred acquisition costs	(12.0		)	0.7			2.5
Postretirement and pension benefits	4.3			4.4			4.2
Deferred federal income taxes	(34.6		)	(5.4		)	(12.2		)
Share-based compensation expense	—			—			(0.1		)
Other, net	1.9			1.6			(4.5		)
Net (loss) income per accompanying consolidated financial statements	$	(10.7	)	$	21.0		$	51.2