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Correction Of Error Relating To Year-End Cut-Off - (b) Consolidated statement of cash flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [line items]      
Change in working capital [1] $ (24.6) $ (31.9) $ (89.9)
Taxation paid [1] (181.8) (190.7) (249.4)
Other   791.3 1,071.3
Cash flows from operating activities 845.0 568.7 [1] 732.0 [1]
Cash flows from investing activities (446.8) (886.8) [1] (908.6) [1]
Loans raised 1,538.0 690.0 [1] 787.6 [1]
Loans repaid (1,604.3) (535.9) [1] (702.5) [1]
Other   (2.5) 0.0
Cash flows from financing activities (104.6) 151.6 [1] 85.1 [1]
Net cash utilised 293.6 (166.5) [1] (91.5) [1]
Effect of exchange rate fluctuation on cash held 1.7 (7.6) [1] 14.3 [1]
Cash and cash equivalents at beginning of the year [1] 219.7 393.8 471.0
Cash and cash equivalents at end of the year 515.0 219.7 [1] 393.8 [1]
previously reported [member]      
Statement [line items]      
Change in working capital   (16.3) (69.4)
Taxation paid   (217.2) (239.5)
Other   791.3 1,071.3
Cash flows from operating activities   557.8 762.4
Cash flows from investing activities   (886.8) (908.6)
Loans raised   691.7 779.7
Loans repaid   (431.9) (695.5)
Other   (2.5) 0.0
Cash flows from financing activities   257.3 84.2
Net cash utilised   (71.7) (62.0)
Effect of exchange rate fluctuation on cash held   (7.6) 14.3
Cash and cash equivalents at beginning of the year 399.7 479.0 526.7
Cash and cash equivalents at end of the year   399.7 479.0
Adjustments [member]      
Statement [line items]      
Change in working capital   (15.6) (20.5)
Taxation paid   (26.5) (8.9)
Other   0.0 0.0
Cash flows from operating activities   10.9 (30.4)
Cash flows from investing activities   0.0 0.0
Loans raised   (1.7) 7.9
Loans repaid   (104.0) (7.0)
Other   0.0 0.0
Cash flows from financing activities   (105.7) 0.9
Net cash utilised   (94.8) (29.5)
Effect of exchange rate fluctuation on cash held   0.0 0.0
Cash and cash equivalents at beginning of the year $ (180.0) (85.2) (55.7)
Cash and cash equivalents at end of the year   $ (180.0) $ (85.2)
[1] Refer note 42.