Pensions And Other Postretirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Estimated contributions by employer to pension plans	$ 4.1
Percentage increase in health care benefits cost	9.00%
Percentage decrease in health care benefits for successive year	0.50%
Estimated future percentage of health care benefits	4.50%
Percentage of change in assumed health care cost trend rate	1.00%
Increase or decrease in other postretirement obligations	1.8
Increase or decrease in current year plan expense	1.9
Expense for defined contribution pension plans	5.7	5.2	3.1
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated benefit payments, 2012	18.9
Estimated benefit payments, 2013	19.5
Estimated benefit payments, 2014	19.3
Estimated benefit payments, 2015	20.1
Estimated benefit payments, 2016	22.4
Estimated benefit payments, thereafter	117.4
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated benefit payments, 2012	2.1
Estimated benefit payments, 2013	2.2
Estimated benefit payments, 2014	2.1
Estimated benefit payments, 2015	2.2
Estimated benefit payments, 2016	2.3
Estimated benefit payments, thereafter	$ 12.6