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Commitments and Contingencies - Commitments (Details) - Capital Addition Purchase Commitments - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Long-term Purchase Commitment [Line Items]    
Unrecorded Unconditional Purchase Obligation   $ 87.7
Scenario, Forecast    
Long-term Purchase Commitment [Line Items]    
Unrecorded Unconditional Purchase Obligation $ 80.0