Other Postretirement Employee Benefit Plans (Funded Status Of The Domestic Plans) (Details) - Other postretirement benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in benefit obligation:
Benefit obligation at beginning of year	$ (167.3)	$ (174.6)
Service cost	(0.5)	(0.7)	$ (0.7)
Interest cost	(5.3)	(5.6)
Amendments, curtailments and other	1.1	(0.4)
Actuarial gain (loss)	9.5	(1.5)
Retiree contributions	(2.6)	(2.9)
Benefits paid	18.6	18.4
Benefit obligation at end of year	(146.5)	(167.3)	$ (174.6)
Change in plan assets:
Fair value of plan assets	0.0	0.0
Funded status	$ (146.5)	$ (167.3)