Pension And Other Retiree Benefits (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	$ 4.8	$ 4.8	$ 10.3	$ 10.1
Interest cost	13.7	13.3	27.5	26.7
Expected return on plan assets	(18.0)	(17.3)	(36.1)	(34.7)
Amortization of prior service cost (credit)	0.4	0.6	0.9	1.1
Amortization of net losses (gains)	5.7	4.7	11.4	9.6
Termination benefit		0.1		0.2
Net periodic benefit cost	6.6	6.2	14.0	13.0
Postretirement Benefits [Member]
Service cost	0.2	0.1	0.5	0.4
Interest cost	1.3	1.3	2.6	2.7
Expected return on plan assets
Amortization of prior service cost (credit)	(0.9)	(1.1)	(1.9)	(1.9)
Amortization of net losses (gains)	0.1	(0.2)	0.1	(0.2)
Termination benefit
Net periodic benefit cost	$ 0.7	$ 0.1	$ 1.3	$ 1.0