Other Post Retirement Employee Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) (Other Post-Retirement Benefits [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Other Post-Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.6	$ 0.9
Interest cost	9.5	6.3
Amortization of loss	4.0	2.3
Amortization of prior service credits	(5.9)	(7.9)
Curtailment loss	3.0
Net periodic benefit cost	$ 12.2	$ 1.6