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Operating Information by Segment and Geographic Area - External Revenue and Total Assets by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 3,655,700 | $ 3,803,200 | $ 4,091,000 | $ 4,118,600 | $ 4,408,700 | $ 4,628,600 | $ 4,146,400 | $ 4,133,600 | $ 15,668,477 | $ 17,317,284 | $ 18,851,008
Total assets | 7,309,812 |  |  |  | 7,966,658 |  |  |  | 7,309,812 | 7,966,658 |
North America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 9,806,400 | 8,439,700 | 8,982,100
Total assets | 3,982,400 |  |  |  | 3,728,800 |  |  |  | 3,982,400 | 3,728,800 |
Asia Pacific (includes Australia) |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,398,200 | 1,763,300 | 1,494,000
Total assets | 562,100 |  |  |  | 533,700 |  |  |  | 562,100 | 533,700 |
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,517,500 | 3,731,600 | 5,326,600
Total assets | 1,403,900 |  |  |  | 1,906,900 |  |  |  | 1,403,900 | 1,906,900 |
Central and South America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,388,100 | 2,375,300 | 1,262,600
Total assets | 812,800 |  |  |  | 1,233,600 |  |  |  | 812,800 | 1,233,600 |
Middle East and Africa |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 558,300 | 1,007,400 | $ 1,785,700
Total assets | $ 548,600 |  |  |  | $ 563,700 |  |  |  | $ 548,600 | $ 563,700 |

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