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Retirement Benefits (Amounts recognized in balance sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]    
Accrued liabilities $ (35.5) $ (26.1)
U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent assets 0.0 4.0
Accrued liabilities (24.1) (15.7)
Noncurrent liabilities (748.3) (514.6)
Net Amount Recognized (772.4) (526.3)
International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent assets 0.0 0.3
Accrued liabilities 0.0 0.0
Noncurrent liabilities (438.5) (345.4)
Net Amount Recognized (438.5) (345.1)
Other Postretirement Benefit Plan, Defined Benefit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accrued liabilities (11.4) (10.4)
Noncurrent liabilities $ (74.9) $ (76.5)