Debt (Narrative) (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019
Debt Instrument [Line Items]
Current borrowing capacity	$ 229,600,000
Letters of Credit Outstanding, Amount	83,100,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	150,000,000.0	$ 100,000,000.0
Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt issuance	$ 800,000,000
Stated interest rate on unsecured senior notes	7.125%
Senior Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt issuance	$ 500,000,000
Stated interest rate on unsecured senior notes	7.75%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 55
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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