Condensed Financial Information Of Registrant (Statement Of Income) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity in net earnings of consolidated subsidiaries									$ 35.9	$ 32.2	$ 14.6
Interest expense									414.8	418.3	376.8
Other, net									24.2	1.7	(7.4)
Total Other income (deductions)									(390.6)	(416.6)	(438.1)
Income from continuing operations before income taxes									752.8	623.5	476.3
Income taxes									261.9	214.7	166.7
Income from continuing operations	153.0	49.5	72.4	216.0	132.1	16.6	66.5	193.6	490.9	408.8	309.6
Income (Loss) from Discontinued Operations - net of taxes	(1.2)	(1.4)	(0.7)	44.5	1.9	2.7	2.9	(0.2)	6.3	7.3	(10.5)
Gain (Loss) on Disposition of Discontinued Operations - net of taxes									34.9	0	0
Net Income (Loss) Attributable to Parent	151.8	48.1	71.7	260.5	134.0	19.3	69.4	193.4	532.1	416.1	299.1
Average common shares outstanding									312,402	291,927	280,442
Diluted average common shares									313,646	300,401	288,491
Basic Earnings (Loss) Per Share, Continuing Operations	$ 0.49	$ 0.16	$ 0.23	$ 0.69	$ 0.42	$ 0.05	$ 0.24	$ 0.68	$ 1.57	$ 1.40	$ 1.10
Discontinued operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.14	$ 0.01	$ 0.01	$ 0.00	$ 0.00	$ 0.13	$ 0.03	$ (0.04)
Basic Earnings (Loss) Per Share	$ 0.48	$ 0.16	$ 0.23	$ 0.83	$ 0.43	$ 0.06	$ 0.24	$ 0.68	$ 1.70	$ 1.43	$ 1.06
Continuing operations	$ 0.49	$ 0.16	$ 0.23	$ 0.69	$ 0.42	$ 0.05	$ 0.22	$ 0.66	$ 1.57	$ 1.36	$ 1.07
Discontinued operations	$ (0.01)	$ 0.00	$ 0.00	$ 0.14	$ 0.01	$ 0.01	$ 0.00	$ 0.00	$ 0.13	$ 0.03	$ (0.04)
Diluted earnings per share	$ 0.48	$ 0.16	$ 0.23	$ 0.83	$ 0.43	$ 0.06	$ 0.22	$ 0.66	$ 1.70	$ 1.39	$ 1.03
Parent Company [Member]
Equity in net earnings of consolidated subsidiaries									621.6	546.1	443.2
Administrative and general expenses									(11.6)	(2.9)	(13.5)
Interest income									3.8	4.6	1.2
Interest expense									(209.5)	(227.6)	(206.1)
Other, net									(5.0)	(10.0)	(10.0)
Total Other income (deductions)									(222.3)	(235.9)	(228.4)
Income from continuing operations before income taxes									399.3	310.2	214.8
Income taxes									(91.6)	(98.6)	(94.8)
Income from continuing operations									490.9	408.8	309.6
Income (Loss) from Discontinued Operations - net of taxes									6.3	7.3	(10.5)
Gain (Loss) on Disposition of Discontinued Operations - net of taxes									34.9	0	0
Net Income (Loss) Attributable to Parent									$ 532.1	$ 416.1	$ 299.1