Pension And Other Benefit Plans - (Components of Net Periodic Benefit Cost Reflected in the Consolidated Condensed Statement of Earnings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service cost:	$ (9.1)	$ (10.0)	$ (8.0)
Other net periodic pension costs:
Nonoperating income (expense)	1.5	2.7	0.1
Net periodic pension cost	$ (7.6)	$ (7.3)	$ (7.9)