Income Taxes-Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Short-term Investments	$ 0.0	$ 7.0
Non-current deferred tax asset	53.9	37.5
Non-current deferred tax liability	31.7	41.4
Deferred Tax Assets, Net	$ 22.2
Deferred Tax Liabilities, Net		$ 3.9