Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Data Center Agreements - Amortization Expense of Capitalized Costs (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Loss Contingencies [Line Items]
Amortization of capitalized costs	$ 5.8	$ 5.8	$ 5.0
IT Services Agreement
Loss Contingencies [Line Items]
Amortization of capitalized costs	5.3	5.3	4.6
EU IT Services Agreement
Loss Contingencies [Line Items]
Amortization of capitalized costs	$ 0.5	$ 0.5	$ 0.4

Amount of amortization of other deferred costs recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Name:	us-gaap_OtherAmortizationOfDeferredCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration