Pension And Other Postretirement Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost - benefits earned during the period	$ 0.4
Interest cost	8.8	7.9
Expected return on plan assets	(9.7)	(8.5)
Recognized net actuarial loss	3.2	3.8
Amortization of prior service cost
Net periodic cost (benefit)	2.7	3.2
Postretirement Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost - benefits earned during the period
Interest cost	0.5	0.6
Recognized net actuarial loss		0.1
Amortization of prior service cost	(0.9)	(1.3)
Net periodic cost (benefit)	$ (0.4)	$ (0.6)