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6. Accumulated Other Comprehensive Income 6. Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021: | $ | 298.6 |  | $ | (26.0) |  | $ | 9.8 |  | $ | 282.4 |
Other comprehensive (loss) income, before reclassifications | (158.4) |  | 1.3 |  | (2.0) |  | (159.1) |
Amounts reclassified from Accumulated other comprehensive income | — |  | 1.6 |  | (0.1) |  | 1.5 |
Income tax effects | 0.2 |  | (0.3) |  | 0.5 |  | 0.4 |
Other comprehensive (loss) income, 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 |
| 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, 2020: | $ | (72.4) |  | $ | (22.2) |  | $ | 7.2 |  | $ | (87.4) |
Other comprehensive (loss) income, before reclassifications | 22.0 |  | (0.3) |  | 4.7 |  | 26.4 |
Amounts reclassified from Accumulated other comprehensive income | — |  | 0.7 |  | (0.6) |  | 0.1 |
Income tax effects | 0.4 |  | 0.2 |  | (0.9) |  | (0.3) |
Other comprehensive income, net of income taxes | 22.4 |  | 0.6 |  | 3.2 |  | 26.2 |
Balances as of June 30, 2020: | $ | (50.0) |  | $ | (21.6) |  | $ | 10.4 |  | $ | (61.2) |
Reclassification Out of Accumulated Other Comprehensive Income [Table Text Block] | The impact to income before taxes for amounts reclassified out of accumulated other comprehensive income into other income, net in the condensed consolidated statements of income were as follows (in millions):
|  | Three Months Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
Components of Comprehensive income |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
Amortization of foreign other post-employment benefit items |  | $ | (1.1) |  |  | $ | (0.4) |  |  | $ | (1.6) |  |  | $ | (0.7) |  |
Net holding gains on equity securities and available-for-sale investments |  | $ | — |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.6 |  |

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