Interim Unaudited Statements of Changes in Stockholder's Equity - USD ($) $ in Millions	Total	COMMON STOCK:	ADDITIONAL PAID-IN CAPITAL:	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS):	RETAINED EARNINGS (ACCUMULATED DEFICIT):
Balance, beginning of period at Dec. 31, 2013	$ 381.4	$ 2.5	$ 847.2	$ (12.7)	$ (455.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	28.3			28.3
Net income (loss)	(19.2)				(19.2)
Change in stockholder’s equity	9.1
Balance, end of period at Jun. 30, 2014	390.5	2.5	847.2	15.6	(474.8)
Balance, beginning of period at Mar. 31, 2014				(14.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	29.7
Net income (loss)	(4.0)
Balance, end of period at Jun. 30, 2014	390.5	2.5	847.2	15.6	(474.8)
Balance, beginning of period at Dec. 31, 2014	303.8	2.5	862.2	4.0	(564.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(20.3)			(20.3)
Net income (loss)	11.9				11.9
Change in stockholder’s equity	(8.4)
Balance, end of period at Jun. 30, 2015	295.4	2.5	862.2	(16.3)	(553.0)
Balance, beginning of period at Mar. 31, 2015				2.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(19.0)
Net income (loss)	64.1
Balance, end of period at Jun. 30, 2015	$ 295.4	$ 2.5	$ 862.2	$ (16.3)	$ (553.0)