Condensed Consolidated Statements of Changes in Shareholder's Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)
Beginning Balance at Dec. 31, 2014	$ 3,961.8	$ 2.8	$ 3,583.9	$ 841.5	$ (466.4)
Comprehensive income (loss):
Net income (loss)	62.0	0.0	0.0	0.0	62.0
Other comprehensive income (loss), after tax	135.3	0.0	0.0	135.3	0.0
Total comprehensive income (loss)	197.3
Employee related benefits	0.2	0.0	0.2	0.0	0.0
Ending Balance at Mar. 31, 2015	4,159.3	2.8	3,584.1	976.8	(404.4)
Beginning Balance at Dec. 31, 2015	3,369.0	2.8	3,272.6	386.8	(293.2)
Comprehensive income (loss):
Net income (loss)	20.5	0.0	0.0	0.0	20.5
Other comprehensive income (loss), after tax	339.3	0.0	0.0	339.3	0.0
Total comprehensive income (loss)	359.8
Employee related benefits	(0.8)	0.0	(0.8)	0.0	0.0
Ending Balance at Mar. 31, 2016	$ 3,728.0	$ 2.8	$ 3,271.8	$ 726.1	$ (272.7)