Accumulated Other Comprehensive Loss (Rollforward) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (1,020.6)	$ (1,348.8)	$ (1,253.4)
Other comprehensive income (loss) before reclassifications	(302.5)	241.9	(183.2)
Amounts reclassified from AOCL	75.6	85.3	92.7
Net current period other comprehensive income (loss)	(226.9)	327.2	(90.5)
Amount attributable to noncontrolling interest	(5.6)	(1.0)	4.9
Ending Balance	(1,241.9)	(1,020.6)	(1,348.8)
Net loss on derivatives qualifying as hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(4.1)	(18.9)	(9.5)
Other comprehensive income (loss) before reclassifications	(15.2)	35.0	(21.8)
Amounts reclassified from AOCL	(9.1)	(20.2)	12.4
Net current period other comprehensive income (loss)	(24.3)	14.8	(9.4)
Amount attributable to noncontrolling interest	0.1	0	0
Ending Balance	(28.5)	(4.1)	(18.9)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(61.5)	(38.8)	(130.9)
Other comprehensive income (loss) before reclassifications	(213.1)	(25.0)	84.6
Amounts reclassified from AOCL	0	0.6	13.3
Net current period other comprehensive income (loss)	(213.1)	(24.4)	97.9
Amount attributable to noncontrolling interest	(5.9)	(1.7)	5.8
Ending Balance	(268.7)	(61.5)	(38.8)
Pension and postretirement benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(955.0)	(1,291.1)	(1,113.0)
Other comprehensive income (loss) before reclassifications	(74.2)	231.9	(246.0)
Amounts reclassified from AOCL	84.7	104.9	67.0
Net current period other comprehensive income (loss)	10.5	336.8	(179.0)
Amount attributable to noncontrolling interest	0.2	0.7	(0.9)
Ending Balance	$ (944.7)	$ (955.0)	$ (1,291.1)