Retirement Plans (Components Of The Net Periodic Benefit Expense (Income) And Total Expense (Income)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Pension Benefits [Member]	Dec. 31, 2010 Pension Benefits [Member]	Dec. 31, 2009 Pension Benefits [Member]	Dec. 31, 2011 Postretirement Benefits [Member]	Dec. 31, 2010 Postretirement Benefits [Member]	Dec. 31, 2009 Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost				$ 86.6	$ 80.4	$ 70.1	$ 8.2	$ 12.2	$ 10.3
Interest cost				192.0	184.0	177.6	22.7	28.4	31.0
Expected return on plan assets				(266.4)	(258.7)	(256.2)	(14.8)	(15.5)	(15.5)
Amortization of prior service credit				(4.4)	(1.9)	(5.3)	(12.5)	(10.8)	(14.6)
Amortization of actuarial loss				50.1	29.7	8.9	0.1	1.3	(2.6)
Curtailments	(38.7)	(38.7)	(0.4)	(38.7)	(0.4)
Net periodic benefit expense (income)				$ 19.2	$ 33.1	$ (4.9)	$ 3.7	$ 15.6	$ 8.6
Discount rate				5.50%	6.00%	6.80%	5.20%	5.70%	6.90%
Rate of compensation increase				4.00%	4.00%	4.00%	3.60%	4.00%	4.00%
Expected return on plan assets				8.40%	8.30%	8.30%	7.60%	7.60%	8.00%