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8. Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Accumulated other comprehensive income included in our Consolidated Balance Sheets and Consolidated Statements of Changes in Stockholders' Equity 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
Balances as of January 1, 2016 | $ | 33.7 |  | $ | (20.7 | ) | $ | 369.1 |  | $ | 382.1 |
Other comprehensive (loss) income, before reclassifications | (32.4 | ) | 0.5 |  | 105.1 |  | 73.2 |
Amounts reclassified from Accumulated other comprehensive income | — |  | 2.5 |  | (0.8 | ) | 1.7 |
Income tax effects | — |  | (0.9 | ) | (38.4 | ) | (39.3 | )
Other comprehensive (loss) income, net of income taxes | (32.4 | ) | 2.1 |  | 65.9 |  | 35.6 |
Balances as of December 31, 2016 | $ | 1.3 |  | $ | (18.6 | ) | $ | 435.0 |  | $ | 417.7 |
Other comprehensive income (loss), before reclassifications | 76.1 |  | (6.5 | ) | 203.6 |  | 273.2 |
Amounts reclassified from Accumulated other comprehensive income | — |  | 2.1 |  | (0.1 | ) | 2.0 |
Income tax effects | — |  | 0.7 |  | (74.9 | ) | (74.2 | )
Effect of adoption of ASU 2018-02** | — |  | — |  | 120.1 |  | 120.1 |
Other comprehensive income (loss), net of income taxes | 76.1 |  | (3.7 | ) | 248.7 |  | 321.1 |
Balances as of December 31, 2017 | $ | 77.4 |  | $ | (22.3 | ) | $ | 683.7 |  | $ | 738.8 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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