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Employee Benefit Obligations - Components of net periodic benefit cost (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Pension Plan, Defined Benefit
      
Components of net periodic benefit cost:      
Service cost $ 3.5 $ 3.0  
Interest cost 11.2 10.6  
Recognized net actuarial (gain) loss (15.3) (1.1)  
Other Postretirement Benefit Plan, Defined Benefit
      
Components of net periodic benefit cost:      
Service cost 0 0  
Interest cost 0 0  
Recognized net actuarial (gain) loss 0 0.1  
Net Periodic Benefit Cost | Pension Plan, Defined Benefit
      
Components of net periodic benefit cost:      
Service cost 3.5 3.4 2.4
Interest cost 11.2 10.6 11.4
Expected return on assets (11.0) (9.7) (9.1)
Amortization of prior service cost 0 0 0.1
Amortization of transition obligation (0.1) (0.8) 0
Recognized net actuarial (gain) loss 1.5 2.1 0.9
Net periodic cost (benefit) 5.1 5.6 5.7
Net Periodic Benefit Cost | Other Postretirement Benefit Plan, Defined Benefit
      
Components of net periodic benefit cost:      
Service cost 0 0 0
Interest cost 0 0 0.1
Expected return on assets 0 0 0
Amortization of prior service cost 0 0 0
Amortization of transition obligation 0 0 0
Recognized net actuarial (gain) loss 0 0 (0.1)
Net periodic cost (benefit) $ 0 $ 0 $ 0