Nature of Operations (Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Segment operating income (loss)	$ 255.1	$ 188.9	$ 157.0
Interest expense	35.4	49.5	44.6
Other non-operating (income) expense, net	(2.4)	(11.2)	17.8
Earnings from continuing operations before income taxes	$ 222.1	$ 150.6	$ 94.6