Pensions And Other Employee Benefits (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Funded status at end of period	$ (315,700,000)
Unfunded benefit obligations, discount rate	4.75%	5.50%	6.00%
Unfunded benefit obligations, decrease in discount rate	0.50%
Change in unfunded benefit obligation as a result of decrease in half percentage point assumed discount rate	36,500,000	31,600,000
Accumulated pension benefit obligation	530,000,000	464,200,000
Expected return on plan assets	8.00%	8.00%	8.00%
Expected return on plan assets, 2012	8.00%
Health care cost trend rate	9.00%	9.00%
Health care cost trend rate, year	2019	2018
Ultimate health care cost trend rate	5.00%	5.00%
Supplemental retirement plan total assets held in trust, total	800,000	2,100,000
Supplemental retirement plan assets held in trust, current	800,000	800,000
Supplemental retirement plan assets held in trust, non current	0	1,300,000
Employee Savings (401k) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to employee savings (401k) plan	6.00%
Participant's base salary rate	66.67%
Employer contributions	11,500,000	10,000,000	8,700,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated actuarial loss to be amortized from accumulated other comprehensive income over next fiscal year	(11,900,000)
Prior service credit for pension benefits will be amortized from accumulated other comprehensive income, net periodic cost	2,700,000
Contribution to qualified pension plan	34,100,000
Estimated employer contribution, next fiscal year	41,000,000
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated actuarial loss to be amortized from accumulated other comprehensive income over next fiscal year	400,000
Prior service credit for pension benefits will be amortized from accumulated other comprehensive income, net periodic cost	700,000
Contribution to qualified pension plan	2,000,000
Estimated employer contribution, next fiscal year	3,000,000
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution to qualified pension plan	$ 1,200,000