Segments - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 573.3	$ 559.6
Segment Profit	278.3	271.6
Research and development expense	(5.3)	(5.8)
Amortization of intangible assets	(2.8)	(2.6)
Spin restructuring	0.0	1.3
Other items, net	(1.3)	1.6
Total before tax	119.0	134.1
Operating Segments
Segment Reporting Information [Line Items]
Segment Profit	172.3	173.9
Segment Reconciling Items
Segment Reporting Information [Line Items]
General corporate and other expenses	(21.6)	(17.2)
Global marketing expense	(3.2)	(3.0)
Research and development expense	(5.3)	(5.8)
Amortization of intangible assets	(2.8)	(2.6)
Acquisition and integration costs	5.7	0.8
Spin restructuring	0.0	1.3
Interest and other financing items	(13.4)	(13.3)
Americas | Operating Segments
Segment Reporting Information [Line Items]
Net sales	373.1	365.1
Segment Profit	123.1	123.1
EMEA | Operating Segments
Segment Reporting Information [Line Items]
Net sales	117.6	114.7
Segment Profit	25.5	26.1
Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Net sales	82.6	79.8
Segment Profit	$ 23.7	24.7
Accounting Standards Update 2017-07 | Selling, General and Administrative Expenses
Segment Reporting Information [Line Items]
Pension benefit		$ 3.1