Accrued Expenses and Other Current Liabilities - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 30, 2016
Payables and Accruals [Abstract]
Employee compensation and benefits	$ 142.6	$ 181.2
Accrued broker fees	31.4	65.4
Accrued taxes	16.9	49.9
Accrued dividend payable	39.0	34.9
Customer deposits	37.1	0.0
Other	27.2	20.7
Total	$ 294.2	$ 352.2