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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 23.8	$ 26.6
Other comprehensive income:
Change in unrealized net loss on investments	(0.3)
Reclassification from accumulated other comprehensive income to interest income for accretion of non-current investments	(0.4)	(0.3)
Net current-period other comprehensive income	(0.7)	(0.3)
Comprehensive income	$ 23.1	$ 26.3

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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