Pension And Other Post-Retirement Benefits (Net Periodic Benefit Expense Related To Post-Retirement Plans) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Other post-retirement plans			$ 6.9
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	3.7	3.3	11.3	10.1
Interest cost	3.3	3.1	9.9	9.1
Expected return on plan assets	(3.0)	(2.7)	(9.0)	(8.0)
Amortization of net actuarial loss from earlier periods	1.2	0.7	3.7	2.1
Amortization of net prior service costs from earlier periods	0.2	0.2	0.5	0.5
Settlement loss	1.6		1.6
Net periodic expense	7.0	4.6	18.0	13.8
Other Post-Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.3	0.2	0.9	0.6
Interest cost	0.2	0.2	0.6	0.6
Amortization of net prior service costs from earlier periods	0.1	0.1	0.2	0.1
Net periodic expense	0.6	0.5	1.7	1.3
Other post-retirement plans			0.3
Estimated additional payments in 2011	0.3		0.3
Funded Pension Contributions [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribution			13.6
Unfunded Pension Contributions [Member]
Defined Benefit Plan Disclosure [Line Items]
Other post-retirement plans			11.1
Estimated additional payments in 2011	$ 0.8		$ 0.8