Other Postretirement Employee Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) - Other Postretirement Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.1	$ 1.1
Interest cost	8.4	10.3
Amortization of net loss	1.0	1.4
Amortization of prior service credit	(3.1)	(4.1)
Net periodic pension cost	$ 7.4	$ 8.7