Retirement And Postretirement Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Net actuarial gains (losses)	$ (104.2)	$ (81.4)
Prior service costs	2.9	3.5
Applicable aggregate tax effect of defined benefit plans	40.7	31.5
Estimated net actuarial loss amortized from accumulated other comprehensive income (loss)	6.1
Estimated prior service cost amortized from accumulated other comprehensive income (loss)	0.6
Accumulated benefit obligation for all defined benefit pension plans	271.6	243.6
Investments in equities of other company	10.00%
Employer contributions	1.0	51.3
Pension expense	6.3	8.4	7.7
Discount rate used to determine the benefit obligation	4.60%	5.10%	5.50%
Effect of one-percentage-point increase/decrease in service and interest costs	0.1
Effect of one-percentage-point increase in benefit obligation	0.9
Effect of one-percentage-point decrease in benefit obligation	0.8
Employer contributions in next fiscal year	0.6
Defined benefit plan estimated future employer contributions in next fiscal, per year, thereafter	1
Discount rate for expense	5.10%	5.50%	7.50%
Defined Contribution Savings Plans [Member]
Pension expense	13.0	12.6	13.0
Postretirement Health Care Plan [Member]
Net actuarial gains (losses)	1.7	1.2
Prior service costs	4.8	5.7
Applicable aggregate tax effect of defined benefit plans	2.5	2.7
Employer contributions	0.4	1.0
Postretirement health care (benefit) cost	(0.1)	(0.1)	1.0
Discount rate used to determine the benefit obligation	4.00%	4.40%	5.50%
Discount rate for expense	4.40%	5.50%	7.50%
Defined Benefit Pension Plan [Member]
Employer contributions	$ 1.0	$ 51.3