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Leases - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Lease cost	$ 9.9	$ 18.4
Variable lease expense	1.8	2.6
Short-term lease expense	$ 0.1	$ 0.2
Rent expense (prior to adoption of ASU 2016-02)			$ 19.7	$ 15.5
Operating lease weighted average remaining lease term	4 years 10 months 24 days
Operating lease weighted average discount rate	3.87%
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	7 years

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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