Segment Results (Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Results [Abstract]
Total consolidated operating income	$ 76.9	$ 72.7	$ 118.5	$ 124.8
Interest expense	14.4	11.5	25.6	26.3
Other non-operating expense	0.3	0.8	0.3	1.1
Other non-operating income	(0.7)	(0.8)	(1.5)	(1.4)
Earnings before income taxes	$ 62.9	$ 61.2	$ 94.1	$ 98.8