Other Income / Expense Other Income / Expense (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Oct. 31, 2014	Jul. 31, 2014	Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2015
Other Income Expense [Abstract]
Extinguishment of Debt, Gain (Loss), Net of Tax				$ 0.0		$ (21.8)
Unamortized Deferred Financing Costs Written Off			$ 4.3
Business Combination, Gain Recognized on Bargain Purchase plus Gain/(Loss) from Change in Redeemable Noncontrolling Interest			0.0	0.0		8.9	[1]
Gain (Loss) on Contract Termination			0.0	0.0		(29.8)	[2]
Foreign Currency Transaction Gain (Loss), Unrealized			(4.2)	12.6		2.4
Other Nonoperating Income (Expense)			0.0	3.0	[3]	(2.1)
Nonoperating Income (Expense)			(8.5)	15.6		(42.4)
Business Combination, Bargain Purchase, Gain Recognized, Amount Net of Tax	$ 3.2	$ 7.0	$ 0.0	0.0		8.9
Noncontrolling Interest, Change in Redemption Value						$ 1.3
Realized Investment Gains (Losses)				$ 3.8

[1] Included within Other (income) / expense, net are gains associated with acquisitions completed during the respective periods. Such income events are non-standard in nature and not reflective of the Company’s core operating results. During the twelve months ended June 30, 2015, the Company recorded a gain of $3.2 million on the re-measurement of a cost investment in an entity that became a wholly owned subsidiary as of October 2014, a $7.0 million bargain purchase gain for an acquisition completed in July 2014, and a $1.3 million loss on a redeemable noncontrolling interest in June 2015.

[2] The Company paid a sponsor advisory agreement termination fee of $29.8 million in connection with its IPO.

[3] Included within Other (income) / expense, net are realized gains associated with the sale of available for sale investments of approximately $3.8 million during the fiscal year ended June 30, 2016.