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BENEFIT PLANS - Components of Net Periodic Benefit Cost - Pension Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31 |  |  |
Expected return on plan assets | 4.85% | 4.85% |
Pension Plans, Defined Benefit |  |  |
Components of Net Periodic Pension Benefit Cost |  |  |
Service cost | $ 2.3 | $ 2.5 | $ 4.0
Interest cost | 32.9 | 34.0 | 21.1
Expected return on plan assets | (28.1) | (27.6) | (30.1)
Amortization of prior service cost | 1.0 | 1.4 | 1.4
Amortization of actuarial loss | 5.1 | 5.6 | 4.2
Net periodic postretirement benefit cost | 13.2 | 15.9 | 0.6
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income |  |  |
Net actuarial loss (gain) | (10.2) | (9.4) | 11.2
Reclassification of prior service cost | (1.0) | (1.4) | (1.4)
Reclassification of actuarial loss | (5.1) | (5.6) | (4.2)
Amount recognized in other comprehensive income | (16.3) | (16.4) | 5.6
Amount recognized in net periodic pension benefit cost and other comprehensive income | $ (3.1) | $ (0.5) | $ 6.2
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31 |  |  |
Discount rate — PBO | 5.00% | 5.19% | 2.92%
Discount rate — service cost | 5.10% | 5.29% | 3.17%
Discount rate — interest cost | 4.90% | 5.09% | 2.37%
Expected return on plan assets | 4.85% | 4.85% | 4.00%
Weighted-average assumptions used to determine benefit obligation at December 31 |  |  |
Discount rate | 5.65% | 5.00% | 5.19%
Other Postretirement Benefit Plans, Defined Benefit |  |  |
Components of Net Periodic Pension Benefit Cost |  |  |
Service cost | $ 2.2 | $ 2.0 | $ 2.2
Interest cost | 2.2 | 2.0 | 0.9
Amortization of prior service cost | 1.4 | 1.4 | (0.3)
Amortization of actuarial loss | (0.7) | (1.5) | (1.3)
Net periodic postretirement benefit cost | 5.1 | 3.9 | 1.5
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income |  |  |
Net actuarial loss (gain) | (3.0) | 3.6 | (2.4)
Reclassification of prior service cost | (1.4) | (1.4) | 0.3
Reclassification of actuarial loss | 0.7 | 1.5 | 1.3
Amount recognized in other comprehensive income | (3.7) | 3.7 | (0.8)
Amount recognized in net periodic pension benefit cost and other comprehensive income | $ 1.4 | $ 7.6 | $ 0.7
Assumed Healthcare Cost Trend Rates at December 31 |  |  |
Rate to which the cost trend rate gradually declines | 4.50% | 4.50% | 4.50%
Year that the rate reaches the rate it is assumed to maintain | 2035 | 2031 | 2030
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31 |  |  |
Discount rate — PBO | 4.90% | 5.09% | 2.59%
Discount rate — service cost | 4.96% | 5.15% | 2.89%
Discount rate — interest cost | 4.85% | 5.03% | 2.06%
Weighted-average assumptions used to determine benefit obligation at December 31 |  |  |
Discount rate | 5.51% | 4.90% | 5.08%
Other Postretirement Benefit Plans, Defined Benefit | Pre-65 |  |  |
Assumed Healthcare Cost Trend Rates at December 31 |  |  |
Healthcare cost trend rate assumed for next year (Pre-65/Post-65) | 8.45% | 10.20% | 7.04%

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Name: | us-gaap_RetirementPlanNameAxis=vmc_Pre65Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |