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Retirement Benefits (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Pension Benefits [Member]
   
Amounts included in accumulated other comprehensive loss, net of tax    
Prior service cost (credit) $ 1.4 $ (0.3)
Net actuarial loss 812.2 1,210.7
Net transition benefit (0.1) (0.1)
Total 813.5 1,210.3
Other Postretirement Benefits [Member]
   
Amounts included in accumulated other comprehensive loss, net of tax    
Prior service cost (credit) (15.1) (21.8)
Net actuarial loss 25.4 37.5
Net transition benefit      
Total $ 10.3 $ 15.7