UNAUDITED STATEMENT OF EQUITY Statement - 9 months ended Sep. 30, 2016 - 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]
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	$ (1,111.7)	$ 0.0	$ 0.0	0.0	(1,111.7)	0.0
Stockholders' Equity, Other Shares		0.0	0.0
Stock Issued During Period, Shares, New Issues		61.0	0.0
Stock Issued During Period, Value, New Issues	781.6	$ 0.6	$ 0.0	781.0	0.0	0.0
Stock Issued During Period, Shares, Treasury Stock Reissued			(0.6)
Stock Granted, Value, Share-based Compensation, Net of Forfeitures		$ 0.0
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		2.4
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	16.4		$ (7.6)	24.0	0.0	0.0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	0.9	$ 0.0	0.0	0.0	0.0	0.9
Stockholders' Equity at Sep. 30, 2016	$ 3,635.1	$ 2.4	$ (22.2)	$ 1,359.8	$ 2,306.6	$ (11.5)
Shares, Issued at Sep. 30, 2016		240.7
Treasury Stock, Shares at Sep. 30, 2016	(1.1)		(1.1)