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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 4.5	$ 20.5	$ 31.0	$ 79.3
Other comprehensive loss:
Change in unrealized net loss on investments		(0.1)	(1.5)	(1.1)
Reclassification from accumulated other comprehensive income to interest income for accretion of non-current investments		(0.5)	(0.3)	(1.4)
Net current period-other comprehensive loss		(0.6)	(1.8)	(2.5)
Comprehensive income	$ 4.5	$ 19.9	$ 29.2	$ 76.8

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51831270

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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