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	$ 424.0	$ 2.5	$ 802.2	$ 2.6	$ (383.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	1.6			1.6
Net income (loss)	(135.2)				(135.2)
Change in stockholder’s equity	(133.6)
Balance, end of period at Sep. 30, 2012	290.4	2.5	802.2	4.2	(518.5)
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)	(5.8)			(5.8)
Net income (loss)	(31.0)				(31.0)
Change in stockholder’s equity	(36.8)
Balance, end of period at Sep. 30, 2013	$ 258.3	$ 2.5	$ 802.2	$ 5.6	$ (552.0)