DEBT (Narrative) (Detail) - USD ($) $ in Millions		12 Months Ended
	Oct. 15, 2018	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Oct. 27, 2022	May 31, 2022	Aug. 13, 2020	Sep. 26, 2013	Feb. 26, 2013	Dec. 08, 2011
Debt Instrument [Line Items]
Interest payments made		$ 42.0	$ 52.0	$ 42.0
Interest rate description		Borrowings under the credit agreement accrue interest based on (i) the Secured Overnight Financing Rate (SOFR) or (ii) a base rate of the highest of (a) the Prime Rate in effect on such day, (b) the NYFRB Rate in effect on such day plus ½ of 1% and (c) the Adjusted Daily Term SOFR Rate. 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%
Covenant Ratio, Debt To Capitalization Limit Following Acquisition		65.00%
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%
3.70% 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%
3.85% 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%
4.24% 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%
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%
3.10% Senior notes due 2030
Debt Instrument [Line Items]
Issued amount of debt							$ 150.0
Date of maturity		Aug. 13, 2030
Stated interest rate		3.10%					3.10%
3.20% Senior notes due 2032
Debt Instrument [Line Items]
Issued amount of debt							$ 150.0
Date of maturity		Aug. 13, 2032
Stated interest rate		3.20%					3.20%
4.49% Senior notes due 2032
Debt Instrument [Line Items]
Issued amount of debt					$ 200.0
Date of maturity		Oct. 27, 2032
Stated interest rate		4.49%			4.49%
4.64% Senior notes due 2034
Debt Instrument [Line Items]
Issued amount of debt					$ 100.0
Date of maturity		Oct. 27, 2034
Stated interest rate		4.64%			4.64%
2022 Senior Notes
Debt Instrument [Line Items]
Date of issuance		Oct. 27, 2022
Issued amount of debt					$ 300.0
2020 Senior Notes
Debt Instrument [Line Items]
Date of issuance		Aug. 13, 2020
Issued amount of debt							$ 300.0
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
2011 Senior Notes
Debt Instrument [Line Items]
Date of issuance		Dec. 08, 2011
Issued amount of debt										$ 300.0
Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 750.0
Line Of Credit Facility Additional Borrowing Capacity						$ 250.0
Standby letters of credit
Debt Instrument [Line Items]
Letters of credit		$ 21.0	$ 20.0
Revolving credit facility
Debt Instrument [Line Items]
Unused credit available under the credit facility		$ 729.0
Long-term debt
Debt Instrument [Line Items]
Weighted-average interest rate		3.70%	3.90%
Unused credit available under the credit facility		$ 2,500.0