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ACCUMULATED OTHER COMPREHENSIVE LOSS Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Statement of Other Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) |
| Postretirement Benefit Plans |  | Cumulative Translation Adjustment |  |  |  | Accumulated Other Comprehensive Loss
December 31, 2020 | $ | (55.9) |  |  | $ | (223.5) |  |  |  |  | $ | (279.4) |
Net change during period | — |  |  | (30.0) |  |  |  |  | (30.0) |
March 31, 2021 | (55.9) |  |  | (253.5) |  |  |  |  | (309.4) |
December 31, 2019 | $ | (133.3) |  |  | $ | (252.0) |  |  |  |  | $ | (385.3) |
Net change during period | 0.9 |  |  | (51.3) |  |  |  |  | (50.4) |
March 31, 2020 | $ | (132.4) |  |  | $ | (303.3) |  |  |  |  | $ | (435.7) |

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