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Retirement Benefits (Amounts recognized in balance sheet) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]    
Accrued liabilities $ 13.5 $ 33.8
US [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent assets 0 0
Accrued liabilities 13.5 10.3
Noncurrent liabilities 964.6 751.3
Net Amount Recognized (978.1) (761.6)
International [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent assets 0.9 6.5
Accrued liabilities 0 23.5
Noncurrent liabilities 270.2 163.2
Net Amount Recognized (269.3) (180.2)
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Accrued liabilities 12.6 12.8
Noncurrent liabilities $ 107.3 $ 101.0