Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 37.7	$ 37.5	$ 39.2
Interest cost	112.8	119.5	125.7
Expected return on assets	(164.6)	(167.0)	(143.7)
Amortization of transition obligation	0	0	0
Amortization of prior service cost	0.2	0.2	2.0
Recognized actuarial loss	81.2	55.7	57.8
Net Periodic Benefit Costs	67.3	45.9	81.0
Settlement loss	1.9	0	1.3
Total Net Periodic Benefits Cost	69.2	45.9	82.3
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	11.2	9.9	9.8
Interest cost	37.5	38.6	41.4
Expected return on assets	(26.7)	(26.6)	(23.8)
Amortization of transition obligation	1.2	1.2	1.3
Amortization of prior service cost	0.3	(0.5)	1.1
Recognized actuarial loss	9.4	6.6	6.7
Net Periodic Benefit Costs	32.9	29.2	36.5
Settlement loss	0	0	0
Total Net Periodic Benefits Cost	$ 32.9	$ 29.2	$ 36.5