Nature of Operations (Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Segment operating income (loss)	$ 184.6	$ 140.5	$ 198.1
Interest expense	49.8	45.3	46.0
Other non-operating expense	0.1	20.1	5.9
Other non-operating (income)	(9.6)	(5.0)	(2.2)
Earnings from continuing operations before income taxes	$ 144.3	$ 80.1	$ 148.4