Accrued Expenses and Other Current Liabilities - Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014
Other Liabilities Disclosure [Abstract]
Employee compensation and benefits	$ 110.3	$ 164.4
Accrued broker fees	34.6	62.0
Accrued income taxes	13.1	35.0
Accrued dividend payable	32.0	24.7
Other	16.9	20.5
Total	$ 206.9	$ 306.6