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Comprehensive Income (Tables) | 3 Months Ended
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Apr. 04, 2021
Comprehensive Income [Abstract] |
Reclassifications Out of Accumulated Other Comprehensive Loss | The following table summarizes the amounts reclassified out of accumulated other comprehensive loss attributable to the Company:
|  | Three Months Ended |
(millions of dollars) |  | Apr. 4, 2021 |  |  | Mar. 29, 2020 |
Amortization of pension items: |  |  |  |  |  |
Pre-tax amount |  | $ | 3.3 |  |  | $ | 2.7 |
Tax |  |  | (0.8 | ) |  |  | (0.6 | )
Net of tax |  | $ | 2.5 |  |  | $ | 2.1 |
Accumulated Other Comprehensive Loss, Net of Related Tax | The major components of accumulated other comprehensive loss, net of related tax, attributable to MTI are as follows:
(millions of dollars) |  | Foreign Currency Translation Adjustment |  |  | Unrecognized Pension Costs |  |  | Net Gain (Loss) on Derivative Instruments |  |  | Total |
Balance as of December 31, 2020 |  | $ | (190.8 | ) |  | $ | (114.9 | ) |  | $ | (2.6 | ) |  | $ | (308.3 | )
Other comprehensive income (loss) before reclassifications |  |  | (28.4 | ) |  |  | — |  |  |  | 4.9 |  |  |  | (23.5 | )
Amounts reclassified from AOCI |  |  | — |  |  |  | 2.5 |  |  |  | — |  |  |  | 2.5 |
Net current period other comprehensive income (loss) |  |  | (28.4 | ) |  |  | 2.5 |  |  |  | 4.9 |  |  |  | (21.0 | )
Balance as of April 4, 2021 |  | $ | (219.2 | ) |  | $ | (112.4 | ) |  | $ | 2.3 |  |  | $ | (329.3 | )

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