Pension And Postretirement Benefits (Components Of Net Periodic Benefits Cost) (Details) - Pension Benefits [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5.4	$ 4.7	$ 5.2
Interest cost	29.5	31.8	37.9
Expected return on plan assets	(57.0)	(56.1)	(62.0)
Amortization of prior service cost	(0.6)	(0.6)	(0.4)
Amortization of net (gain) loss	14.3	11.3	12.3
Recognized Curtailments Gain/(Loss)	(0.3)	0.0	(5.2)
Settlement costs	0.5	0.0	0.8
Net periodic benefit cost	$ (8.2)	$ (8.9)	$ (11.4)