Debt Covenant, Amount of Borrowing Available

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- Definition

Debt Instrument, Covenant Ratio, Debt To Capitalization Limit

+ References

No definition available.

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- Definition

Additional borrowing capacity under the credit facility based on an accordion feature.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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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
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ 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.

+ Details

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Publisher FASB
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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
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Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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
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-Topic 210
-SubTopic 10
-Section S99
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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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DEBT (Narrative) (Detail) - USD ($) $ in Millions		12 Months Ended
DEBT (Narrative) (Detail) - USD ($) $ in Millions	Oct. 15, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 13, 2020	Oct. 31, 2018	Sep. 26, 2013	Feb. 26, 2013	Dec. 08, 2011
Debt Instrument [Line Items]
Interest payments made		$ 31.0	$ 30.0	$ 32.0
Interest rate description		Borrowings under the credit agreement accrue interest based on (i) Libor or (ii) a base rate of the highest of (a) the federal funds rate plus 0.5%, (b) BofA’s announced prime rate, or (c) the Eurocurrency rate plus 1%, plus a margin. The interest rate and level of facility fees are dependent on certain financial ratios, as defined in the Credit Agreement. The Credit Agreement also provides customary fees, including administrative agent and commitment fees. In connection with the Credit Agreement, the Corporation paid customary transaction fees that have been deferred and are being amortized over the term of the Credit Agreement.
Debt to capitalization limit		60.00%
2013 Senior Notes
Debt Instrument [Line Items]
Date of issuance		Feb. 26, 2013
Issued amount of debt								$ 500.0
Repayments of Long-term Debt	$ 50.0
3.70% Senior notes due 2023
Debt Instrument [Line Items]
Issued amount of debt								$ 225.0
Date of maturity		Feb. 26, 2023
Stated interest rate		3.70%						3.70%
3.85% Senior notes due 2025
Debt Instrument [Line Items]
Issued amount of debt								$ 100.0
Date of maturity		Feb. 26, 2025
Stated interest rate		3.85%						3.85%
4.05% Senior notes due 2028
Debt Instrument [Line Items]
Issued amount of debt								$ 75.0
Date of maturity		Feb. 26, 2028
Stated interest rate		4.05%						4.05%
4.11% Senior notes due 2028
Debt Instrument [Line Items]
Date of issuance		Sep. 26, 2013
Issued amount of debt							$ 100.0
Date of maturity		Sep. 26, 2028
Stated interest rate		4.11%					4.11%
2011 Notes
Debt Instrument [Line Items]
Date of issuance		Dec. 08, 2011
Issued amount of debt									$ 300.0
3.84% Senior notes due 2021
Debt Instrument [Line Items]
Issued amount of debt									$ 100.0
Date of maturity		Dec. 01, 2021
Stated interest rate		3.84%							3.84%
4.24% Senior notes due 2026
Debt Instrument [Line Items]
Issued amount of debt									$ 200.0
Date of maturity		Dec. 01, 2026
Stated interest rate		4.24%							4.24%
3.20% Senior Notes due 2032
Debt Instrument [Line Items]
Issued amount of debt					$ 150.0
Stated interest rate		3.20%			3.20%
3.10% Senior Notes due 2030
Debt Instrument [Line Items]
Issued amount of debt					$ 150.0
Stated interest rate		3.10%			3.10%
Two Thousand Twenty Senior Notes [Member]
Debt Instrument [Line Items]
Date of issuance		Aug. 13, 2020
Issued amount of debt					$ 300.0
Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 500.0
Line Of Credit Facility Additional Borrowing Capacity			200.0			$ 100.0
Standby letters of credit
Debt Instrument [Line Items]
Letters of credit		$ 21.1	$ 32.6
Revolving credit facility
Debt Instrument [Line Items]
Weighted-average interest rate		1.40%	3.30%
Unused credit available under the credit facility		$ 479.0
Long-term debt
Debt Instrument [Line Items]
Weighted-average interest rate		3.40%	3.70%
Unused credit available under the credit facility		$ 1,500.0