Pensions And Other Postretirement Benefits (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8.0	$ 5.8
Interest cost	12.0	13.6
Expected return on plan assets	(14.8)	(15.5)
Prior service costs	1.0	1.2
Net actuarial loss	7.4	5.2
Net periodic benefit cost	13.6	10.3
Quarterly pension contributions	14.4	23.8
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3.6	2.4
Interest cost	5.2	5.9
Expected return on plan assets	(4.3)	(4.3)
Prior service costs	0.7	0.6
Net actuarial loss	2.9	2.9
Net periodic benefit cost	8.1	7.5
Quarterly OPEB contributions	$ 21.9	$ 21.9