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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2022
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 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 | (348.2) |  | 0.7 |  | (14.4) |  | (361.9) |
Amounts reclassified from Accumulated other comprehensive income (loss) | — |  | 0.1 |  | 0.4 |  | 0.5 |
Income tax effects | 0.6 |  | (0.3) |  | 3.3 |  | 3.6 |
Other comprehensive income (loss), net of income taxes | (347.6) |  | 0.5 |  | (10.7) |  | (357.8) |
Balances as of June 30, 2022: | $ | (518.1) |  | $ | (10.4) |  | $ | (4.9) |  | $ | (533.4) |
| Foreign currency translation adjustments | Foreign other post-employment benefits adjustments | Net unrealized holding gains on available-for-sale investments | Total accumulated other comprehensive income (loss)
Balances as of January 1, 2021: | $ | 298.6 |  | $ | (26.0) |  | $ | 9.8 |  | $ | 282.4 |
Other comprehensive income (loss), before reclassifications | (158.4) |  | 1.3 |  | (2.0) |  | (159.1) |
Amounts reclassified from Accumulated other comprehensive income (loss) | — |  | 1.6 |  | (0.1) |  | 1.5 |
Income tax effects | 0.2 |  | (0.3) |  | 0.5 |  | 0.4 |
Other comprehensive income (loss), net of income taxes | (158.2) |  | 2.6 |  | (1.6) |  | (157.2) |
Balances as of June 30, 2021: | $ | 140.4 |  | $ | (23.4) |  | $ | 8.2 |  | $ | 125.2 |
Reclassification Out of Accumulated Other Comprehensive Income [Table Text Block] |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
Components of comprehensive income (loss) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Amortization of foreign other post-employment benefit items |  | $ | (0.1) |  |  | $ | (1.1) |  |  | $ | (0.1) |  |  | $ | (1.6) |
Net holding gains on equity securities and available-for-sale investments |  | $ | (0.4) |  |  | $ | — |  |  | $ | (0.4) |  |  | $ | 0.1 |

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