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Employee Benefit Plans - Schedule of net periodic benefit costs for all plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Pension Benefits [Member]
     
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost $ 3.6 $ 3.3 $ 2.9
Interest cost 2.2 2.1 2.0
Plan curtailments 0.5 0 0
Expected return on plan assets (3.1) (3.2) (2.8)
Amortization of net actuarial losses (gains) 0 0 0
Net Periodic Benefit Cost 3.2 2.2 2.1
Other Benefits [Member]
     
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 0 0 0
Interest cost 0.3 0.3 0.4
Plan curtailments 0 0 0
Expected return on plan assets 0 0 0
Amortization of net actuarial losses (gains) 0 0.2 0
Net Periodic Benefit Cost $ 0.3 $ 0.5 $ 0.4