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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive income included in our condensed consolidated balance sheets consists of the following components (in millions):
| Foreign currency translation adjustments | Foreign other post-employment benefits adjustments | Net unrealized holding gains (losses) on available-for-sale investments | Total accumulated other comprehensive income (loss)
Balances as of January 1, 2023: | $ | (466.5) |  | $ | 10.0 |  | $ | (10.3) |  | $ | (466.8) |
Other comprehensive income, before reclassifications | 55.4 |  | 0.1 |  | 4.0 |  | 59.5 |
Amounts reclassified from Accumulated other comprehensive income (loss) | — |  | (0.1) |  | 0.2 |  | 0.1 |
Income tax effects | (0.2) |  | 0.1 |  | (1.0) |  | (1.1) |
Other comprehensive income, net of income taxes | 55.2 |  | 0.1 |  | 3.2 |  | 58.5 |
Balances as of March 31, 2023: | $ | (411.3) |  | $ | 10.1 |  | $ | (7.1) |  | $ | (408.3) |
| Foreign currency translation adjustments | Foreign other post-employment benefits adjustments | Net unrealized holding gains (losses) on available-for-sale investments | Total accumulated other comprehensive income (loss)
Balances as of January 1, 2022: | $ | (170.5) |  | $ | (10.9) |  | $ | 5.8 |  | $ | (175.6) |
Other comprehensive income (loss), before reclassifications | (128.7) |  | 0.4 |  | (5.2) |  | (133.5) |
Income tax effects | 0.1 |  | (0.1) |  | 1.2 |  | 1.2 |
Other comprehensive income (loss), net of income taxes | (128.6) |  | 0.3 |  | (4.0) |  | (132.3) |
Balances as of March 31, 2022: | $ | (299.1) |  | $ | (10.6) |  | $ | 1.8 |  | $ | (307.9) |

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