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Commitments and Contingencies - Purchase Obligations (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]    
Purchase Obligation, Due in Next Twelve Months $ 1,204.7  
Purchase Obligation, Due in Second and Third Year 1.7  
Purchase Obligation, Due in Fourth and Fifth Year 1.8  
Purchase Obligation, Due after Fifth Year   $ 2.0
Other Commitment, Due in Next Twelve Months $ 1,406.0