Accrued Expenses and Other Current Liabilities - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2017	Jun. 30, 2016
Payables and Accruals [Abstract]
Employee compensation and benefits	$ 178.7	$ 181.2
Accrued broker fees	54.2	65.4
Accrued taxes	27.9	49.9
Accrued dividend payable	38.1	34.9
Customer deposits	38.8	0.0
Other	26.4	20.7
Total	$ 364.0	$ 352.2