Pension And Other Post Retirement Benefit Plans (Defined Benefit Pension And Post Retirement Benefit Plans) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Benefits [Member]
Service cost - benefits earned during the period	$ 1.1	$ 0.9	$ 1.7	$ 1.4
Interest cost on projected benefit obligations	4.4	4.6	8.5	8.9
Expected return on plan assets	(4.8)	(4.3)	(9.1)	(8.1)
Amortization of net actuarial loss	0.8	0.7	1.6	1.4
Amortization of prior service (benefit)
Net periodic benefit cost	1.5	1.9	2.7	3.6
Settlements	0.1		0.1
Total net periodic benefit cost	1.6	1.9	2.8	3.6
Other Benefits [Member]
Service cost - benefits earned during the period	0.2	0.3	0.4	0.5
Interest cost on projected benefit obligations	0.4	0.4	0.7	0.6
Expected return on plan assets
Amortization of net actuarial loss	0.5	0.3	0.9	0.5
Amortization of prior service (benefit)	(0.1)		(0.1)
Net periodic benefit cost	1.0	1.0	1.9	1.6
Settlements
Total net periodic benefit cost	$ 1.0	$ 1.0	$ 1.9	$ 1.6