STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY - USD ($) shares in Millions, $ in Millions	Total	Og and E [Member]	Common Stock	Common Stock Og and E [Member]	Premium on Common Stock	Premium on Common Stock Og and E [Member]	Retained Earnings	Retained Earnings Og and E [Member]
Common Stock, Shares, Outstanding			199.7	40.4
Stockholders' Equity Attributable to Parent		$ 3,603.3		$ 100.9		$ 930.9		$ 2,571.5
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares			0.0	0.0
Net Income (Loss) Attributable to Parent		350.2		$ 0.0		0.0		350.2
Dividends, Common Stock, Cash, Number of Shares			0.0	0.0
Dividends, Common Stock		(325.0)		$ 0.0		0.0		325.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares			0.4	0.0
Stock-based compensation	$ 3.6	4.8	$ 0.0	$ 0.0	$ 3.6	4.8	$ 0.0	0.0
Common Stock, Shares, Outstanding			200.1	40.4
Stockholders' Equity Attributable to Parent		3,958.3		$ 100.9		935.7		2,921.7
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares			0.0	0.0
Net Income (Loss) Attributable to Parent		339.4		$ 0.0		0.0		339.4
Dividends, Common Stock, Cash, Number of Shares			0.0
Dividends, Common Stock								0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares			0.0	0.0
Stock-based compensation	$ 2.7	$ (2.9)	$ 0.0	$ 0.0	(6.7)	(2.9)	0.0	0.0
Common Stock, Shares, Outstanding	200.1	40.4	200.1	40.4
Stockholders' Equity Attributable to Parent	$ 3,631.8	$ 3,975.6		$ 100.9		938.6		2,936.1
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares			0.0	0.0
Net Income (Loss) Attributable to Parent		360.0		$ 0.0		0.0		360.0
Dividends, Common Stock, Cash, Number of Shares			0.0	0.0
Dividends, Common Stock		(265.0)		$ 0.0		0.0		265.0
Proceeds from Contributed Capital, Shares				0.0
Proceeds from Contributed Capital		530.0		$ 0.0		530.0		0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares			0.0	0.0
Stock-based compensation	$ 6.4	$ 2.2	$ 0.0	$ 0.0	$ 1.2	2.2	$ 0.0	0.0
Common Stock, Shares, Outstanding	200.1	40.4	200.1	40.4
Stockholders' Equity Attributable to Parent	$ 4,056.3	$ 4,602.8		$ 100.9		$ 1,470.8		$ 3,031.1