Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4.2	$ 4.1
Interest cost	5.0	6.4
Expected return on plan assets	(8.7)	(10.2)
Amortization of net actuarial loss	3.0	2.6
Amortization of prior service cost	0.3	0.3
Net periodic pension or postretirement benefit cost	3.8	3.2
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	0.4	0.4
Amortization of prior service cost	0.1	0.0
Net periodic pension or postretirement benefit cost	$ 0.5	$ 0.4