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Debt and Credit Arrangements - New Credit Agreement and New Credit Facility (Details) - Revolving Credit Facility - Subsequent Event	Oct. 18, 2021 USD ($)
New Credit Facility
Debt Instrument
Maximum borrowing capacity	$ 1,000,000,000
Potential periodic increase to maximum borrowing amount	500,000,000.0
Potential increase to maximum borrowing amount	$ 25,000,000.0
Debt instrument term (years)	5 years
Potential increase to applicable margin (percent)	0.05%
Potential decrease to applicable margin (percent)	0.025%
Potential increase to sustainability fee (percent)	0.01%
Potential decrease to sustainability fee (percent)	0.01%
Maximum percentage of capital stock guaranteed by company	65.00%
New Credit Agreement - Sublimit For Letter Of Credit
Debt Instrument
Maximum borrowing capacity	$ 100,000,000.0
New Credit Agreement - Sublimit For Discretionary Letter Of Credit
Debt Instrument
Maximum borrowing capacity	250,000,000.0
New Credit Agreement - SwinLine
Debt Instrument
Maximum borrowing capacity	$ 100,000,000.0
New Credit Agreement - SwinLine | Base Rate
Debt Instrument
Debt instrument variable interest rate (percent)	0.50%
New Credit Agreement - SwinLine | Base Rate | Minimum
Debt Instrument
Debt instrument variable interest rate (percent)	0.25%
New Credit Agreement - SwinLine | Base Rate | Maximum
Debt Instrument
Debt instrument variable interest rate (percent)	1.25%
New Credit Agreement - SwinLine | One-month LIBOR
Debt Instrument
Debt instrument variable interest rate (percent)	1.00%
New Credit Agreement - SwinLine | LIBOR | Minimum
Debt Instrument
Debt instrument variable interest rate (percent)	1.25%
Commitment fee (percent)	0.20%
New Credit Agreement - SwinLine | LIBOR | Maximum
Debt Instrument
Debt instrument variable interest rate (percent)	2.25%
Commitment fee (percent)	0.35%

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- Definition

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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