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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended 36 Months Ended 48 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2021
Cash flows from operating activities:          
Net income $ 153,185 $ 332,964 $ 375,856    
Adjustments to reconcile net income to net cash provided by operating activities:          
Depreciation and amortization expense 314,987 66,126 61,550    
Fixed asset impairment 20,037 5,411 0    
Reduction in carrying value of operating right-of-use assets 45,339 28,480 30,372    
Loss on equity method investments 2,161 366 0    
Charge/(credit) on interest rate hedge 891 (910) (923)    
Amortization of financing costs and debt discount 12,890 523 540    
Stock compensation expense 133,844 26,271 26,819    
Loss on extinguishment of debt 73,894 0 0    
Deferred tax (benefit)/expense (60,616) 927 (1,537)    
Unrealized foreign exchange (gain)/loss (6,054) 5,979 590    
Other non-cash items 3,589 (6,949) 2,018    
Changes in operating assets and liabilities, net of acquired assets and assumed liabilities:          
Accounts receivable 113,513 (175,040) (101,545)    
Unbilled revenue (17,656) (5,748) (55,790)    
Unearned revenue (69,121) 291,844 86,567    
Other net assets 108,259 (2,209) (11,976)    
Net cash provided by operating activities 829,142 568,035 412,541    
Cash flows from investing activities:          
Purchase of property, plant and equipment (93,750) (40,885) (38,948)    
Purchase of subsidiary undertakings (net of cash acquired) (5,914,475) (47,931) (131,272)    
Investment in equity method investments (2,450) (2,450) 0    
Loan to equity method investment (10,000) 0 0    
Sale of available for sale investments 497 47,902 21,686    
Purchase of available for sale investments (480) 0 (9,603)    
Purchase of investments in equity - long term (3,577) (3,212) (3,890) $ (13,300) $ (16,900)
Net cash used in investing activities (6,024,235) (46,576) (162,027)    
Cash flows from financing activities:          
Financing costs (30,328) (1,554) 0    
Drawdown of credit lines and facilities 5,905,100 350,000 0    
Repayment of credit lines and facilities (877,780) (350,000) 0    
Purchase of noncontrolling interest 0 (43,923) 0    
Proceeds from the exercise of equity compensation 118,589 13,203 21,645    
Share issue costs (853) (14) (13)    
Repurchase of ordinary shares 0 (175,000) (146,931)    
Share repurchase costs 0 (140) (107)    
Settlement of interest rate hedge 0 (905) 0    
Net cash provided by financing activities 5,114,728 (208,333) (125,406)    
Effect of exchange rate movements on cash (7,727) 6,870 (650)    
Net (decrease)/increase in cash and cash equivalents (88,092) 319,996 124,458    
Cash and cash equivalents at beginning of year 840,305 520,309 395,851    
Cash and cash equivalents at end of year $ 752,213 $ 840,305 $ 520,309 $ 840,305 $ 752,213