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Goodwill and Other Intangible Assets - Schedule of Estimated Remaining Amortization Expense (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2019 $ 3.0  
2020 3.0  
2021 1.8  
Thereafter 0.1  
Net Carrying Value $ 7.9 $ 6.5