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Correction Of Error Relating To Year-End Cut-Off - (a) Consolidated statement of financial position (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Times
Dec. 31, 2017
USD ($)
Times
Dec. 31, 2016
USD ($)
Statement [line items]          
Cash and cash equivalents $ 393,800 $ 515,000 $ 219,700 [1] $ 393,800 [1] $ 471,000 [1]
Trade and other receivables 171,800 137,100 138,600 [1] 171,800  
Other 5,939,200   5,551,400 5,939,200  
Total assets 6,504,800 6,561,300 5,909,700 [1] 6,504,800  
Borrowings 1,587,900 1,160,900 1,814,300 [1] 1,587,900 [1]  
Current portion of borrowings 194,500 684,900 92,500 [1] 194,500 [1]  
Trade and other payables 463,100 594,400 417,500 [1] 463,100  
Taxation payable 46,700 24,800 [1] 900 [1] 46,700 [1] 87,000 [1]
Other 809,600   877,600 809,600  
Total liabilities 3,101,800 3,652,600 3,202,800 [1] 3,101,800  
Total equity 3,403,000 2,908,700 2,706,900 [1] 3,403,000 3,173,300
Net debt 1,388,600   1,687,100 1,388,600  
Adjusted EBITDA $ 1,263,700 $ 1,233,300 $ 1,111,600 $ 1,263,700  
Net debt to adjusted EBITDA | Times     1.52 1.10  
previously reported [member]          
Statement [line items]          
Cash and cash equivalents     $ 399,700 $ 479,000 526,700
Trade and other receivables     153,200 201,900  
Other     5,551,400 5,939,200  
Total assets     6,104,300 6,260,100  
Borrowings     1,925,300 1,587,900  
Current portion of borrowings     86,300 193,600  
Trade and other payables     503,000 548,500  
Taxation payable     5,200 77,500  
Other     877,600 809,600  
Total liabilities     3,397,400 3,217,100  
Total equity     2,706,900 3,403,000  
Net debt     1,611,900 1,302,500  
Adjusted EBITDA     $ 1,111,600 $ 1,263,700  
Net debt to adjusted EBITDA | Times     1.45 1.03  
Adjustments [member]          
Statement [line items]          
Cash and cash equivalents     $ (180,000) $ (85,200) $ (55,700)
Trade and other receivables     (14,600) (30,100)  
Other     0 0  
Total assets     (194,600) (115,300)  
Borrowings     (111,000) 0  
Current portion of borrowings     6,200 900  
Trade and other payables     (85,500) (85,400)  
Taxation payable     (4,300) (30,800)  
Other     0 0  
Total liabilities     (19,460) (115,300)  
Total equity     0 0  
Net debt     75,200 86,100  
Adjusted EBITDA     $ 0 $ 0  
Net debt to adjusted EBITDA | Times      
[1] Refer note 42.