Employee Benefits (Components Of Estimated Pension And Postretirement Benefits Expense) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Expense [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 21.3	$ 20.1	$ 64.1	$ 60.3
Interest cost	48.4	46.2	145.4	138.1
Expected return on assets	(67.2)	(64.8)	(201.6)	(193.7)
Amortization, net	12.4	6.5	37.4	19.2
Net periodic benefit expense (benefit)	14.9	8.0	45.3	23.9
Postretirement Benefits Expense[Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1.8	3.1	6.4	9.2
Interest cost	5.2	7.1	17.6	21.3
Expected return on assets	(3.6)	(3.8)	(11.2)	(11.6)
Amortization, net	(5.0)	(2.5)	(7.5)	(7.2)
Net periodic benefit expense (benefit)	$ (1.6)	$ 3.9	$ 5.3	$ 11.7