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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Accounting Policies [Abstract]          
Funds Receivable $ 27.7   $ 27.7   $ 32.3
Funds Held for Clients 10.5   10.5   9.7
Client fund obligations 38.2   38.2   $ 42.0
Research and development expense, software (excluding acquired in process cost) 15.7 $ 23.7 37.8 $ 40.4  
Payments to acquire software     26.4 $ 16.7  
Debt Instrument [Line Items]          
Long-term Debt 2,745.2   2,745.2    
Senior Notes          
Debt Instrument [Line Items]          
Long-term Debt 2,100.0   2,100.0    
Fair Value, Inputs, Level 2 | Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, fair value disclosure $ 2,252.0   $ 2,252.0