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Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Significant Accounting Policies [Line Items] |
Changes in Accumulated Other Comprehensive Loss Net of Tax | Changes in accumulated other comprehensive loss, net of tax, are as follows:
|  | (Dollars in Millions) |
|  | Pension and Postretirement Benefit Plans |  |  | Foreign Currency |  |  | Accumulated Other Comprehensive Loss |
|  | Three Months Ended March 31, 2021 |
Balance at beginning of period |  | $ | (158.1 | ) |  | $ | (0.3 | ) |  | $ | (158.4 | )
Other comprehensive earnings before reclassifications, net of tax |  |  | — |  |  |  | 0.3 |  |  |  | 0.3 |
Amounts reclassified from accumulated other comprehensive earnings, net of tax |  |  | 2.5 |  |  |  | — |  |  |  | 2.5 |
Other comprehensive earnings, net of tax |  |  | 2.5 |  |  |  | 0.3 |  |  |  | 2.8 |
Balance at end of period |  | $ | (155.6 | ) |  | $ | — |  |  | $ | (155.6 | )
|  | Three Months Ended March 31, 2020 |
Balance at beginning of period |  | $ | (144.9 | ) |  | $ | (0.9 | ) |  | $ | (145.8 | )
Other comprehensive loss before reclassifications, net of tax |  |  | — |  |  |  | (2.1 | ) |  |  | (2.1 | )
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 2.5 |  |  |  | — |  |  |  | 2.5 |
Other comprehensive earnings (loss), net of tax |  |  | 2.5 |  |  |  | (2.1 | ) |  |  | 0.4 |
Balance at end of period |  | $ | (142.4 | ) |  | $ | (3.0 | ) |  | $ | (145.4 | )
Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss | Changes in net noncurrent deferred tax assets related to accumulated other comprehensive loss are as follows:
|  | Pension and Postretirement Benefit Plans |
|  | Three Months Ended |
|  | March 31, |
|  | 2021 |  |  | 2020 |
|  | (Dollars in Millions) |
Balance at beginning of period |  | $ | 89.4 |  |  | $ | 85.2 |
Tax effect of other comprehensive earnings |  |  | (0.7 | ) |  |  | (0.8 | )
Balance at end of period |  | $ | 88.7 |  |  | $ | 84.4 |
Reclassification Out of Accumulated Other Comprehensive Loss | Reclassifications out of accumulated other comprehensive loss are as follows:
|  | Three Months Ended |  |  | Affected line items in the consolidated
|  | March 31, |  |  | statements of earnings and
|  | 2021 |  |  | 2020 |  |  | comprehensive earnings
|  | (Dollars in Millions) |
Pension and postretirement benefit plans |  |  |  |  |  |  |  |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |
Actuarial loss |  | $ | 3.2 |  |  | $ | 3.3 |  |  | Other nonoperating (income) and expenses, net
Tax benefit |  |  | (0.7 | ) |  |  | (0.8 | ) |  | Income tax expense
|  | $ | 2.5 |  |  | $ | 2.5 |  |  |
Basic and Diluted Earnings Per Common Share | The following table reconciles the numerator and denominator for basic and diluted earnings per common share:
|  | Three Months Ended |
|  | March 31, |
|  | 2021 |  |  | 2020 |
|  | (In Millions) |
Net earnings attributable to Martin Marietta |  | $ | 65.3 |  |  | $ | 25.9 |
Less: Distributed and undistributed earnings attributable to unvested awards |  |  | 0.1 |  |  |  | — |
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta |  | $ | 65.2 |  |  | $ | 25.9 |
Basic weighted-average common shares outstanding |  |  | 62.3 |  |  |  | 62.3 |
Effect of dilutive employee and director awards |  |  | 0.2 |  |  |  | 0.2 |
Diluted weighted-average common shares outstanding |  |  | 62.5 |  |  |  | 62.5 |
Reconciliation of Cash, Cash Equivalents and Restricted Cash | The following table reconciles cash, cash equivalents and restricted cash as reported on the consolidated balance sheets to the aggregated amounts presented on the consolidated statements of cash flows:
|  | March 31, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
|  | (Dollars in Millions) |
Cash and cash equivalents |  | $ | 313.9 |  |  | $ | 207.3 |
Restricted cash |  |  | 40.9 |  |  |  | 97.1 |
Total cash, cash equivalents and restricted cash presented in the consolidated statements of cash flows |  | $ | 354.8 |  |  | $ | 304.4 |
Parent |
Significant Accounting Policies [Line Items] |
Comprehensive Earnings | Comprehensive earnings attributable to Martin Marietta is as follows:
|  | Three Months Ended |
|  | March 31, |
|  | 2021 |  |  | 2020 |
|  | (Dollars in Millions) |
Net earnings attributable to Martin Marietta |  | $ | 65.3 |  |  | $ | 25.9 |
Other comprehensive earnings, net of tax |  |  | 2.8 |  |  |  | 0.4 |
Comprehensive earnings attributable to Martin Marietta |  | $ | 68.1 |  |  | $ | 26.3 |

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