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, 2015	$ 3,369.0	$ 2.8	$ 3,272.6	$ 386.8	$ (293.2)
Comprehensive income (loss):
Net income (loss)	51.8	0.0	0.0	0.0	51.8
Other comprehensive income (loss), after tax	632.2	0.0	0.0	632.2	0.0
Comprehensive income (loss)	684.0
Dividends paid and distributions of capital	(274.0)	0.0	(274.0)	0.0	0.0
Employee related benefits	(0.6)	0.0	(0.6)	0.0	0.0
Ending Balance at Jun. 30, 2016	3,778.4	2.8	2,998.0	1,019.0	(241.4)
Beginning Balance at Dec. 31, 2016	3,376.3	2.8	2,994.4	559.5	(180.4)
Comprehensive income (loss):
Net income (loss)	27.6	0.0	0.0	0.0	27.6
Other comprehensive income (loss), after tax	186.6	0.0	0.0	186.6	0.0
Comprehensive income (loss)	214.2
Dividends paid and distributions of capital	(261.0)	0.0	(261.0)	0.0	0.0
Employee related benefits	0.3	0.0	0.3	0.0	0.0
Ending Balance at Jun. 30, 2017	$ 3,329.8	$ 2.8	$ 2,733.7	$ 746.1	$ (152.8)