Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Marketable securities	$ 1.0	$ 8.2
Derivative assets	2.3	0.3
Deferred compensation investment	25.9	22.9
Total assets	29.2	31.4
Derivative liabilities	27.8	53.1
Deferred compensation liabilities	40.4	36.5
Total liabilities	68.2	89.6
Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Marketable securities	1.0	8.2
Deferred compensation investment	25.9	22.9
Total assets	26.9	31.1
Level 2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative assets	2.3	0.3
Total assets	2.3	0.3
Derivative liabilities	27.8	53.1
Deferred compensation liabilities	40.4	36.5
Total liabilities	$ 68.2	$ 89.6