Payables and Accrued Expensess - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Payables and Accruals [Abstract]
Accounts payable	$ 146.5	$ 133.7
Employee compensation and benefits	213.0	232.2
Accrued broker fees	70.9	87.0
Accrued taxes	28.3	68.9
Accrued dividend payable	61.8	55.4
Managed services administration fees	57.0	53.1
Customer deposits	57.4	34.8
Operating lease liabilities	32.3
Other	69.9	46.6
Total	$ 737.2	$ 711.7