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Segment and Geographical Data (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
segment
Mar. 31, 2021
USD ($)
Segment Reporting [Abstract]        
Number of operating segments | segment     1  
Segment Reporting Information [Line Items]        
Revenues $ 274.5 $ 284.2 $ 563.8 $ 569.5
United States        
Segment Reporting Information [Line Items]        
Revenues 139.8 148.4 290.7 297.9
International        
Segment Reporting Information [Line Items]        
Revenues $ 134.7 $ 135.8 $ 273.1 $ 271.6