Accrued Expenses and Other Current Liabilities - Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014
Other Liabilities Disclosure [Abstract]
Employee compensation and benefits	$ 90.9	$ 164.4
Accrued broker fees	36.5	62.0
Accrued income taxes	18.3	35.0
Accrued dividend payable	31.8	24.7
Other	12.5	20.5
Total	$ 190.0	$ 306.6