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Description of Business and Basis of Presentation - Narrative (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jan. 02, 2020
USD ($)
Jan. 02, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Initial cash proceeds | €   € 180.0          
VARTAAG              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Initial cash proceeds $ 323.1     $ 345.8      
Pre-tax loss     $ (0.4)   $ 0.0 $ 137.2 $ 0.0