| **Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands** | 3 Months Ended | 6 Months Ended |
|------------------------------------------------------------------------------|----------------|----------------|
||
| **Statement of Comprehensive Income [Abstract]**                             |           |           |   |   |
| Net income                                                                   | $ 118,217      | $ 127,563      | $ 227,789 | $ 231,824 |
| **Components of other comprehensive income (loss):**                         |           |           |   |   |
| Foreign currency translation adjustments                                     | (32,620)       | (290)          | 11,323 | 76,531 |
| Pension and other postretirement plan adjustments, net of tax                | 19             | (173)          | (440) | (749) |
| Total other comprehensive income (loss)                                      | (32,601)       | (463)          | 10,883 | 75,782 |
| Total comprehensive income                                                   | $ 85,616       | $ 127,100      | $ 238,672 | $ 307,606 |

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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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