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v3.23.3

Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 USD ($) State Plant | Sep. 30, 2022 Plant | Sep. 30, 2023 USD ($) Segment Plant Facility State | Sep. 30, 2022 USD ($) Plant | Dec. 31, 2022 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of quarries and yards | Facility |  |  | 350 |  |
Number of states in which entity operates | State | 28 |  | 28 |  |
Reportable business segments | Segment |  |  | 2 |  |
Restricted cash | $ 0.0 |  | $ 0.0 |  | $ 0.8
Number of days restricted from utilizing cash |  |  |  |  | 180 days
Restricted investments |  |  | 0.0 | $ 704.6 |
Restricted investments | $ 0.0 |  | $ 0.0 |  | $ 704.6
0.650% Senior Notes, Due 2023 (discharged) |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 700.0
Interest rate on notes | 0.65% |  | 0.65% |  | 0.65%
Maturity year |  |  | 2023 |  | 2023
Pension and Postretirement Benefit Plans |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Other comprehensive loss, before reclassifications, net of tax |  |  | $ (0.2) | $ 33.0 |
California |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of cement plants | Plant | 1 | 1 | 1 | 1 |

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