Statements of Changes in Stockholder's Equity (USD $) In Millions, unless otherwise specified		Total	COMMON STOCK:	ADDITIONAL PAID-IN CAPITAL:	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS):		RETAINED EARNINGS (ACCUMULATED DEFICIT):
Balance, beginning of period at Dec. 31, 2011	[1]	$ 424.0	$ 2.5	$ 802.2	$ 2.6		$ (383.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)		4.9			4.9	[1]
Net income (loss)		(22.5)					(22.5)	[1]
Change in stockholder’s equity	[1]	(17.6)
Balance, end of period at Mar. 31, 2012	[1]	406.4	2.5	802.2	7.5		(405.8)
Balance, beginning of period at Dec. 31, 2012		295.1	2.5	802.2	11.4		(521.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)		(16.0)			(16.0)
Net income (loss)		(20.4)					(20.4)
Change in stockholder’s equity		(36.4)
Balance, end of period at Mar. 31, 2013		$ 258.7	$ 2.5	$ 802.2	$ (4.6)		$ (541.4)

[1] Amounts reflect the cumulative impact of the retrospective adoption of amended guidance to ASC 944, Financial Services Insurance (ASU 2010-26), as detailed more fully within Note 2 to these financial statements.