Quarterly Financial Information - (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended								12 Months Ended
	Jul. 01, 2015	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
Restructuring Cost and Reserve [Line Items]
Net sales		$ 432.4	$ 361.0	$ 334.0	$ 506.8	$ 399.1	$ 374.3	$ 356.9	$ 501.3	$ 1,634.2	$ 1,631.6	$ 1,840.4
Gross profit		187.3	153.7	141.6	229.8	183.1	170.8	168.5	233.8	712.4	756.2	850.4
Net earnings/(loss)		$ 21.6	$ 24.2	$ 16.4	$ 65.5	$ 23.1	$ (19.6)	$ (69.2)	$ 61.7	$ 127.7	$ (4.0)	$ 157.3
Earnings Per Share
Basic net earnings per share (in dollars per share)		$ 0.35	$ 0.39	$ 0.27	$ 1,060,000.00	$ 0.37	$ (0.32)	$ (1.11)	$ 0.99	$ 2.06	$ (0.06)	$ 2.53
Diluted net earnings per share (in dollars per share)		$ 0.34	$ 0.39	$ 0.26	$ 1,050,000.00	$ 0.37	$ (0.32)	$ (1.11)	$ 0.99	$ 2.04	$ (0.06)	$ 2.53
Spin costs		$ 0.0	$ 1.3	$ 1.8	$ 3.9
Venezuela deconsolidation charge						$ 0.0	$ 0.0	$ 65.2	$ 0.0	$ 0.0	$ 65.2	$ 0.0
Non-cash restructuring costs										4.9	13.1	4.1
Cost of early debt retirement						0.0	16.7	0.0	0.0
Integration (2)		6.4	2.6	0.0	0.0	0.2	0.3	0.4	0.3
Inventory step up		5.0	0.0	0.0	0.0
Adjustments to prior year tax accruals		(2.6)	(8.8)	0.0	0.0	(1.4)	(2.6)	0.0	0.0
Spin-off
Earnings Per Share
Non-cash restructuring costs		3.3	0.7	(0.6)	0.8	2.8	7.9	15.6	0.7	5.8	39.1	0.0
2013 restructuring
Earnings Per Share
Non-cash restructuring costs		$ 0.0	$ 0.1	$ 0.9	$ 2.1	$ (0.1)	$ 12.4	$ 0.3	$ (6.1)	$ 2.5	$ 9.6	$ 43.5
Common Stock
Earnings Per Share
Common stock distributed, shares	62,200,000.0										62,193,000