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		$ 3,455.7		$ 100.9		$ 926.3		$ 2,428.5
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares			0.0	0.0
Net Income (Loss) Attributable to Parent		328.0		$ 0.0		0.0		328.0
Dividends, Common Stock, Cash, Number of Shares			0.0	0.0
Dividends, Common Stock		(185.0)		$ 0.0		0.0		(185.0)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares			0.0	0.0
Stock-based compensation	$ 13.0	4.6	$ 0.0	$ 0.0	$ 13.0	4.6	$ 0.0	0.0
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
Dividends, Common Stock								0.0
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	200.1	40.4
Stockholders' Equity Attributable to Parent	$ 4,139.5	$ 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	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			0.0	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