Pension And Postretirement Benefits (Components Of Net Periodic Benefits Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5.9	$ 5.4	$ 4.7
Interest cost	30.1	29.5	31.8
Expected return on plan assets	(65.6)	(57.0)	(56.1)
Amortization of prior service cost	(0.5)	(0.6)	(0.6)
Amortization of net (gain) loss	14.2	14.3	11.3
Recognized Curtailments Gain/(Loss)	0.3	(0.3)	0.0
Settlement costs	0.3	0.5	0.0
Net periodic benefit cost	(15.3)	(8.2)	(8.9)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.3	0.0	0.0
Interest cost	1.1	0.2	0.3
Expected return on plan assets	0.0	0.0	0.0
Amortization of prior service cost	(1.0)	(0.2)	(0.2)
Amortization of net (gain) loss	(0.2)	(0.3)	(0.3)
Recognized Curtailments Gain/(Loss)	0.0	0.0	0.0
Settlement costs	0.0	0.0	0.0
Net periodic benefit cost	$ 0.2	$ (0.3)	$ (0.2)