Business Segment Information (Details 2) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Sales and property by geographic region
Sales	$ 1,667.5	$ 1,599.2	$ 1,554.3	$ 1,490.3	$ 1,538.6	$ 1,474.0	$ 1,440.3	$ 1,426.6	$ 6,311.3	$ 5,879.5	$ 6,307.9
Property	583.9				578.3				583.9	578.3	605.6
United States [Member]
Sales and property by geographic region
Sales									3,458.4	3,213.4	3,446.8
Property	443.4				445.4				443.4	445.4	472.1
Canada [Member]
Sales and property by geographic region
Sales									343.4	316.4	366.6
Property	8.8				7.3				8.8	7.3	7.3
Europe, Middle East and Africa [Member]
Sales and property by geographic region
Sales									1,193.7	1,147.2	1,174.0
Property	52.5				49.9				52.5	49.9	50.4
Asia Pacific [Member]
Sales and property by geographic region
Sales									866.4	764.4	834.5
Property	40.0				37.4				40.0	37.4	41.9
Latin America [Member]
Sales and property by geographic region
Sales									449.4	438.1	486.0
Property	$ 39.2				$ 38.3				$ 39.2	$ 38.3	$ 33.9