Employee Benefit Obligations - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
UNITED STATES
Components of net periodic benefit cost:
Service cost	$ 0.8	$ 0.6
Interest cost	3.3	3.7
Recognized net actuarial (gain) loss	4.4	(6.8)
UNITED STATES | Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	0.8	0.6	$ 0.8
Interest cost	3.3	3.7	3.7
Expected return on assets	(5.2)	(5.2)	(5.6)
Amortization of transition obligation	0.0	0.0	0.0
Recognized net actuarial (gain) loss	1.6	0.7	0.2
Non-US [Member]
Components of net periodic benefit cost:
Service cost	3.4	2.6
Interest cost	4.4	5.7
Recognized net actuarial (gain) loss	22.4	(36.0)
Non-US [Member] | Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	3.4	2.6	2.6
Interest cost	4.4	5.7	6.2
Expected return on assets	(4.2)	(4.2)	(5.2)
Amortization of transition obligation	0.3	0.1	0.7
Recognized net actuarial (gain) loss	$ 3.9	$ 0.8	$ 1.3
Minimum [Member] | UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		2.80%	3.40%	3.50%
Components of net periodic benefit cost:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		7.00%	7.00%	7.30%
Maximum | UNITED STATES | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		4.00%	4.30%	4.20%
Components of net periodic benefit cost:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		7.00%	7.30%	7.50%
Spectrum Brands [Member] | Minimum [Member] | Non-US [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		1.00%	1.75%	2.00%
Components of net periodic benefit cost:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		1.00%	1.80%	2.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		2.25%	2.25%	2.30%
Spectrum Brands [Member] | Maximum | Non-US [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		13.50%	13.81%	13.50%
Components of net periodic benefit cost:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		3.70%	4.53%	5.30%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		7.00%	5.50%	5.50%