Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Contractual Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]
Data center expenses	$ 106.0	$ 99.9	$ 97.2
Facilities and equipment leases	38.1	36.5	39.1
Software license agreements	26.5	24.8	25.7
Software/hardware maintenance agreements	53.3	48.9	52.4
Total expenses	$ 223.9	$ 210.1	$ 214.4