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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