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Employee Benefit Obligations - Schedule of Pension and Other Post-retirement benefit plans (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated other comprehensive (loss) income $ (126.8) $ 309.0
UNITED STATES    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accrued Benefit Cost / Funded Status 1.6  
Defined Benefit Plan, Fair Value of Plan Assets $ 11.2 $ 11.6