Nature Of Operations (Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Nature Of Operations [Abstract]
Segment operating income	$ 271.2	[1]	$ 239.8	[1]	$ 87.5	[1]
Interest expense	53.7		48.5		21.2
Other non-operating expense	0.5		1.3		1.2
Other non-operating income	(3.5)		(3.8)		(8.0)
Earnings from continuing operations before income taxes	$ 220.5		$ 193.8		$ 73.1

[1] Segment operating income (loss) is the measure of segment profit or loss reviewed by the chief operating decision maker. The sum of the segments’ operating income (loss) equals the total consolidated operating income as reported on our income statement. The following reconciles our total consolidated operating income to earnings from continuing operations before income taxes. These items are only measured and managed on a consolidated basis::