Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Marketable securities	$ 8.2	$ 10.0
Derivative assets	0.3	16.7
Deferred compensation investment	23.7	22.2
Total assets	32.2	48.9
Derivative liabilities	53.1	2.6
Deferred compensation liabilities	37.3	31.2
Total liabilities	90.4	33.8
Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Marketable securities	8.2	10.0
Deferred compensation investment	23.7	22.2
Total assets	31.9	32.2
Level 2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative assets		16.7
Total assets		16.7
Derivative liabilities	53.1	2.6
Deferred compensation liabilities		31.2
Total liabilities	$ 90.4	$ 33.8