Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income per common share
Net income	[1]	$ 30.7	$ 32.1	$ 76.8	$ 92.3
Weighted average shares outstanding (basic - in millions)		63,400,000	63,300,000	63,300,000	63,200,000
Effect of dilutive stock options and other unvested equity awards (in millions)		500,000	600,000	500,000	600,000
Weighted average shares outstanding (diluted - in millions)		63,900,000	63,900,000	63,800,000	63,800,000
Basic earnings per share		$ 0.49	$ 0.51	$ 1.21	$ 1.46
Diluted earnings per share		$ 0.48	$ 0.50	$ 1.21	$ 1.44
Shares with anti-dilutive effect excluded from the computation of diluted earnings per share (in millions)		800,000	700,000	700,000	700,000
Performance-based stock awards
Income per common share
Shares with anti-dilutive effect excluded from the computation of diluted earnings per share (in millions)				800,000	1,400,000

[1] Net income attributable to Hillenbrand