Employee Benefit Plans (Summary Of Under-Funded Or Non-Funded Pension Benefit Plans With Projected Benefit Obligation In Excess Of Plan Assets) (Details) (Non-Funded Pension Benefit Plans [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Non-Funded Pension Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 383.5	$ 350.8
Fair value of plan assets	$ 250.7	$ 228.8