Business Segment Information (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Identifiable assets	$ 6,229.5	$ 5,844.6	$ 5,636.5
Depreciation and amortization	152.5	145.2	138.6
Components of Identifiable assets Depreciation and amortization and Capital expenditures for property
Purchase accounting depreciation and amortization	21.6	19.3	19.8
Capital expenditures	141.0	146.2	139.6
Architecture and Software [Member]
Segment Reporting Information [Line Items]
Identifiable assets	1,874.5	1,653.4	1,648.4
Depreciation and amortization	64.8	68.1	61.6
Components of Identifiable assets Depreciation and amortization and Capital expenditures for property
Capital expenditures	33.6	31.5	24.6
Control Products and Solutions [Member]
Segment Reporting Information [Line Items]
Identifiable assets	2,273.7	2,200.0	2,270.7
Depreciation and amortization	65.9	57.7	57.1
Components of Identifiable assets Depreciation and amortization and Capital expenditures for property
Capital expenditures	51.2	52.8	55.3
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	2,081.3	1,991.2	1,717.4
Depreciation and amortization	0.2	0.1	0.1
Components of Identifiable assets Depreciation and amortization and Capital expenditures for property
Capital expenditures	56.2	61.9	59.7
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 130.9	$ 125.9	$ 118.8