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Employee Benefit Obligations - Schedule of Pension and Other Post-retirement benefit plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued Benefit Cost / Funded Status $ (88.0) $ (82.6)  
Defined Benefit Plan, Fair Value of Plan Assets 189.5 204.5  
Accumulated other comprehensive (loss) income (40.7) 243.6  
Tax effects (47.3) (189.5)  
Noncontrolling interest $ 67.4 (42.6)  
Defined Benefit Plan, Target Plan Asset Allocations 100.00%    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 14.7 $ 13.9 $ 12.1
Other Postretirement Benefit 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 1.80% 2.00%  
Minimum [Member] | 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 3.40% 3.50%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.00% 7.30%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase  
Maximum | 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 4.30% 4.20%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.30% 7.50%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase  
Accumulated Defined Benefit Plans Adjustment      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated other comprehensive (loss) income $ (28.5) $ (21.8)  
Tax effects 1.3 0.8  
Noncontrolling interest 18.6 13.6  
Non-US [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued Benefit Cost / Funded Status (67.4) (69.6)  
Employee benefit obligations 184.3 196.1 189.2
Obligations assumed from acquisitions 0.6 0.0  
Defined Benefit Plan, Other Changes (1.8) 0.0  
Service cost 2.6 3.0  
Interest cost 6.2 7.4  
Recognized net actuarial (gain) loss 10.6 8.6  
Benefits paid (11.8) (6.2)  
Defined Benefit Plan, Curtailments (0.9) 0.0  
Foreign currency exchange rate changes (17.3) (5.9)  
Defined Benefit Plan, Fair Value of Plan Assets 116.9 126.5 117.0
Actual return on plan assets 3.6 7.7  
Employer contributions 7.8 10.4  
Foreign currency exchange rate changes (9.2) (2.4)  
Non-US [Member] | Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 2.6 3.0 2.8
Interest cost 6.2 7.4 7.1
Recognized net actuarial (gain) loss (1.3) (1.4) (0.9)
UNITED STATES      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accrued Benefit Cost / Funded Status (20.6) (13.0)  
Employee benefit obligations 93.2 91.0 85.3
Obligations assumed from acquisitions 0.0 0.0  
Defined Benefit Plan, Other Changes 0.0 0.0  
Service cost 0.8 0.5  
Interest cost 3.7 3.8  
Recognized net actuarial (gain) loss 3.1 6.7  
Benefits paid (5.4) (5.3)  
Defined Benefit Plan, Curtailments 0.0 0.0  
Foreign currency exchange rate changes 0.0 0.0  
Defined Benefit Plan, Fair Value of Plan Assets 72.6 78.0 73.8
Actual return on plan assets (1.0) 6.1  
Employer contributions 1.0 3.4  
Foreign currency exchange rate changes 0.0 0.0  
UNITED STATES | Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 0.8 0.5 0.6
Interest cost 3.7 3.8 3.5
Recognized net actuarial (gain) loss $ (0.2) $ (0.1) $ (1.2)
Equity Securities | Minimum [Member]      
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 [Member]      
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 [Member]      
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%