Accumulated Other Comprehensive Loss (Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (2,125.9)
Other comprehensive income (loss) before reclassifications	(86.9)
Amounts reclassified from AOCL	4.2
Net current period other comprehensive income (loss)	(82.7)	$ (233.8)
Amount attributable to noncontrolling interest	0.0	$ (5.1)
Ending Balance	(2,208.6)
Net loss on derivatives qualifying as hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(42.9)
Other comprehensive income (loss) before reclassifications	16.0
Amounts reclassified from AOCL	(19.3)
Net current period other comprehensive income (loss)	(3.3)
Amount attributable to noncontrolling interest	0.0
Ending Balance	(46.2)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(956.5)
Other comprehensive income (loss) before reclassifications	(102.9)
Amounts reclassified from AOCL	2.4
Net current period other comprehensive income (loss)	(100.5)
Amount attributable to noncontrolling interest	0.0
Ending Balance	(1,057.0)
Pension and postretirement benefits [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(1,126.5)
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from AOCL	21.1
Net current period other comprehensive income (loss)	21.1
Amount attributable to noncontrolling interest	0.0
Ending Balance	$ (1,105.4)