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Intangible Assets - Projected Annual Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 5.9  
2018 5.8  
2019 5.8  
2020 4.9  
2021 3.8  
Thereafter 37.3  
Net $ 63.5 $ 70.8