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Debt - Revolving Credit Agreement Amendment (Details) - Line of Credit $ in Millions	Sep. 30, 2021	Apr. 03, 2020 USD ($)	Apr. 02, 2020 USD ($)
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 300	$ 180
Debt instrument, covenant terms, senior secured indebtedness to EBITDA ratio		5.00	4.75
Letter of credit outstanding, minimum amount to test covenant		$ 105
Debt instrument, covenant, total indebtedness to EBITDA ratio	3.50	3.25
Unamortized deferred financing costs		$ 1
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 90	$ 50

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

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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.

+ 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
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Debt Instrument, Covenant Terms, Senior Secured Indebtedness To EBITDA Ratio

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Debt Instrument, Covenant Terms, Total Indebtedness To EBITDA Ratio

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Letter Of Credit Outstanding, Minimum Amount To Test Covenant

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