UNAUDITED STATEMENT OF EQUITY Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock, Value [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Shares, Issued		177.3
Stockholders' Equity	$ 3,947.9	$ 1.8	$ 14.6	$ 554.8	$ 3,418.3	$ (12.4)
Treasury Stock, Shares	(0.5)		0.5
Stockholders' Equity at Dec. 31, 2015	$ 3,947.9	$ 1.8	$ 14.6	554.8	3,418.3	(12.4)
Shares, Issued at Dec. 31, 2015		177.3
Treasury Stock, Shares at Dec. 31, 2015	(0.5)		0.5
Net income	$ (863.8)	$ 0.0	$ 0.0	0.0	(863.8)	0.0
Stockholders' Equity, Other Shares		0.0	0.0
Stock Issued During Period, Shares, New Issues		38.0	0.0
Stock Issued During Period, Value, New Issues	368.6	$ 0.4	$ 0.0	368.2	0.0	0.0
Stock Issued During Period, Shares, Treasury Stock Reissued			(0.3)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	4.8		$ (3.6)	8.4	0.0	0.0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		2.3
Stock Granted, Value, Share-based Compensation, Net of Forfeitures		$ 0.0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(0.2)	$ 0.0	0.0	0.0	0.0	0.2
Shares, Issued		177.3
Shares, Issued at Mar. 31, 2016		217.6
Stockholders' Equity	$ 3,947.9	$ 1.8	$ 14.6	554.8	3,418.3	(12.4)
Treasury Stock, Shares	(0.5)		0.5
Treasury Stock, Shares at Mar. 31, 2016	(0.8)		0.8
Stockholders' Equity at Mar. 31, 2016	$ 3,457.7	$ 2.2	$ (18.2)	931.4	2,554.5	(12.2)
Shares, Issued		217.6
Stockholders' Equity	$ 3,457.7	$ 2.2	$ (18.2)	$ 931.4	$ 2,554.5	$ (12.2)
Treasury Stock, Shares	(0.8)		0.8