Accrued Expenses and Other Current Liabilities - Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2014
Other Liabilities Disclosure [Abstract]
Employee compensation and benefits	$ 132.6	$ 164.4
Accrued broker fees	49.8	62.0
Accrued taxes	24.7	35.0
Accrued dividend payable	31.6	24.7
Other	12.2	20.5
Total	$ 250.9	$ 306.6