Employee Benefit Obligations - Schedule of Pension and Other Post-retirement benefit plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets, beginning of year	$ 190.8	$ 168.6
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets	6.7
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.80%
Accumulated other comprehensive income	87.7	413.2
Tax effects	(57.9)	(226.2)
Noncontrolling interest	15.5	14.2
Defined Benefit Plan, Target Plan Asset Allocations	100.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	12.1	2.8	5.3
Pension Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Funded Status of Plan	(83.7)	(92.1)
Benefit obligation, beginning of year	260.7	228.7
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	14.7	0
Service cost	3.0	2.0
Interest cost	10.6	11.4
Recognized net actuarial (gain) loss	1.1	31.3
Participant contributions	0.1	0.2
Benefits paid	(17.4)	(10.9)
Defined Benefit Plan, Curtailments	(1.5)	0
Foreign currency exchange rate changes	3.2	(2.0)
Fair value of plan assets, beginning of year	190.8	168.6	143.7
Actual return on plan assets	18.3	22.3
Employer contributions	12.9	13.6
Plan expenses paid	0	0
Foreign currency exchange rate changes	1.6	(0.3)
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)	(0.6)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.70%	4.00%
Benefit obligation, beginning of year	0.6	0.5
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation	0	0
Service cost	0	0
Interest cost	0	0.1
Recognized net actuarial (gain) loss	(0.1)	0
Participant contributions	0	0
Benefits paid	0	0
Defined Benefit Plan, Curtailments	(0.1)
Foreign currency exchange rate changes	0	0
Fair value of plan assets, beginning of year	0	0	0
Actual return on plan assets	0	0
Employer contributions	0	0
Plan expenses paid	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	1.80%	4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	3.60%	4.00%
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	13.00%	13.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.80%	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	(17.8)	(21.3)
Tax effects	(0.8)	4.4
Noncontrolling interest	11.9	14.2
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	3.90%	4.40%
Fair value of plan assets, beginning of year	73.8	66.4
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.60%	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	3.90%	5.30%
Fair value of plan assets, beginning of year	$ 117.0	$ 102.2
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	4.70%	5.40%
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%