Business Segment and Geographic Information (Schedule of Geographic Information) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers		$ 2,463.0	$ 2,434.4	$ 2,271.2	$ 2,355.8	$ 2,449.4	$ 2,470.2	$ 2,414.5	$ 2,560.8	$ 9,524.4	$ 9,894.9	$ 10,439.0
Long-Lived Assets	[1]	8,852.7				8,745.1				8,852.7	8,745.1	8,941.6
United States
Revenue from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										3,792.3	4,280.1	4,507.6
Long-Lived Assets	[1]	3,780.2				3,788.5				3,780.2	3,788.5	3,754.2
Canada
Revenue from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										225.7	247.1	311.4
Long-Lived Assets	[1]	639.0				577.4				639.0	577.4	518.0
Europe, excluding United Kingdom [Member]
Revenue from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	[1]	0.0				0.0				0.0	0.0	0.0
United Kingdom
Revenue from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	[1]	0.0				0.0				0.0	0.0	0.0
Europe [Member]
Revenue from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										2,505.9	2,315.4	2,628.0
Asia, excluding China [Member]
Revenue from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										1,382.7	1,395.2	1,389.4
Long-Lived Assets	[1]	1,056.5				914.2				1,056.5	914.2	989.9
China
Revenue from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										1,176.2	1,129.1	981.0
Long-Lived Assets	[1]	1,721.9				1,732.7				1,721.9	1,732.7	1,582.7
Latin America [Member]
Revenue from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										441.6	528.0	621.6
Long-Lived Assets	[1]	$ 349.0				$ 337.3				$ 349.0	$ 337.3	$ 440.1

[1] Long-lived assets include plant and equipment, net.