Segment Results (Reconciliation Of Total Consolidated Operating Income To Earnings From Continuing Operations Before Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Results [Abstract]
Total consolidated operating income	$ 108.6	$ 91.1	$ 228.9	$ 215.9
Interest expense	14.1	11.3	39.7	37.6
Other non-operating expense	0.2	0.1	0.5	1.2
Other non-operating income	(0.6)	(1.7)	(2.1)	(3.1)
Earnings from continuing operations before income taxes	$ 94.9	$ 81.4	$ 190.8	$ 180.2