Employee Benefit Obligations - Schedule of Pension and Other Post-retirement benefit plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 204.5	$ 190.8
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	0	6.7
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.50%
Accumulated other comprehensive income	243.6	87.7
Tax effects	(189.5)	(57.9)
Noncontrolling interest	(42.6)	15.5
Defined Benefit Plan, Target Plan Asset Allocations	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	13.9	12.1	2.8
Pension Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Funded Status of Plan	(82.6)	(83.7)
Benefit obligation, beginning of year	274.5	260.7
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	0	14.7
Service cost	3.5	3.0
Interest cost	11.2	10.6
Recognized net actuarial (gain) loss	15.3	1.1
Participant contributions	0	0.1
Benefits paid	(11.5)	(17.4)
Defined Benefit Plan, Curtailments	0	(1.5)
Foreign currency exchange rate changes	(5.9)	3.2
Defined Benefit Plan, Fair Value of Plan Assets	204.5	190.8	168.6
Actual return on plan assets	13.8	18.3
Employer contributions	13.8	12.9
Foreign currency exchange rate changes	(2.4)	1.6
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Funded Status of Plan	(0.4)	(0.4)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.70%		4.70%
Benefit obligation, beginning of year	0.4	0.6
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	0	0
Service cost	0	0
Interest cost	0	0
Recognized net actuarial (gain) loss	0	(0.1)
Participant contributions	0	0
Benefits paid	0	0
Defined Benefit Plan, Curtailments		(0.1)
Foreign currency exchange rate changes	0	0
Defined Benefit Plan, Fair Value of Plan Assets	0	0	0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	0	0
Actual return on plan assets	0	0
Employer contributions	0	0
Foreign currency exchange rate changes	0	0
Minimum | Pension Plan, Defined Benefit
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	2.00%		1.80%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	2.00%		3.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.30%		2.30%
Maximum | Pension Plan, Defined Benefit
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%		13.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%		7.80%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	5.50%		5.50%
Accumulated Defined Benefit Plans Adjustment
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated other comprehensive income	(21.8)	(17.8)
Tax effects	0.8	(0.8)
Noncontrolling interest	$ 13.6	$ 11.9
UNITED STATES
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	4.20%		3.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%		7.60%
Outside of the United States
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	3.30%		3.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	4.30%		4.70%
Equity Securities | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	0.00%
Equity Securities | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	60.00%
Fixed income securities | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	0.00%
Fixed income securities | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	40.00%
Other plan asset investments | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	0.00%
Other plan asset investments | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	100.00%