Employee Benefit Plans (Schedule Of Components Of Pension Cost) (Details) (USD $) In Millions	3 Months Ended					9 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2011	Sep. 30, 2010	Mar. 31, 2010	Sep. 30, 2011 Cash Balance Plan [Member]	Sep. 30, 2010 Cash Balance Plan [Member]	Sep. 30, 2011 Cash Balance Plan [Member]	Sep. 30, 2010 Cash Balance Plan [Member]	Sep. 30, 2011 Unfunded Executive Pension Plans [Member]	Sep. 30, 2010 Unfunded Executive Pension Plans [Member]	Sep. 30, 2011 Unfunded Executive Pension Plans [Member]	Sep. 30, 2010 Unfunded Executive Pension Plans [Member]
Service cost				$ 1.1	$ 0.6	$ 3.0	$ 1.9	$ 0.1	$ 0	$ 0.4	$ 0.7
Interest cost on projected benefit obligation				3.0	3.0	9.0	9.2	0.3	0.5	1.0	1.5
Expected return on plan assets				(2.9)	(3.1)	(8.5)	(9.2)
Curtailment (benefit) loss recognized during the period	(1.5)		2.3					0	0	(1.5)	2.3
Settlement loss recognized during the period		1.4						0	1.4	0	1.4
Amortization and deferrals - net				2.3	1.7	5.8	4.9	0	0	0	(0.1)
Pension cost				$ 3.5	$ 2.2	$ 9.3	$ 6.8	$ 0.4	$ 1.9	$ (0.1)	$ 5.8