Pension And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost - benefits earned during the period	$ 0.4	$ 0.1	$ 0.4	$ 0.1
Interest cost	9.2	8.2	25.0	24.5
Expected return on plan assets	(9.9)	(8.8)	(27.0)	(26.3)
Recognized net actuarial loss	3.8	4.2	11.3	12.6
Amortization of transition asset		(0.4)		(1.2)
Net periodic cost (benefit)	3.5	3.3	9.7	9.7
Postretirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost - benefits earned during the period	0.1		0.1	0.1
Interest cost	0.6	0.7	1.8	2.0
Recognized net actuarial loss	0.1	0.1	0.3	0.3
Amortization of prior service cost	(1.3)	(1.5)	(3.9)	(4.4)
Net periodic cost (benefit)	$ (0.5)	$ (0.7)	$ (1.7)	$ (2.0)