Pension Plans And Other Postretirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions to qualified and nonqualified pension plans	$ 1.4	$ 50.8
U.S. Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Premiums paid to the U.S. postretirement benefit plan	$ 1.1	$ 1.1