Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Data Center Agreements - Total Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Loss Contingencies [Line Items]
Total Expenses	$ 106.0	$ 99.9	$ 97.2
Information Technology Services Agreement [Member]
Loss Contingencies [Line Items]
Total Expenses	98.5	95.3	95.7
EU Information Technology Services Agreement [Member]
Loss Contingencies [Line Items]
Total Expenses	$ 7.5	$ 4.6	$ 1.5