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Revision to prior period financial statements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Property, plant and equipment. | $ 1,468.0 |  | $ 1,468.0 |  | $ 1,322.2 | [1] |
Deferred tax liabilities | 97.6 |  | 97.6 |  | 88.6 | [1] |
Retained earnings | (6,724.5) |  | (6,724.5) |  | (6,944.0) | [1] |
Non-current deferred revenue | 104.5 |  | 104.5 |  | 45.4 |  |
Current deferred revenue | 28.3 |  | 28.3 |  | 19.5 |  |
Revenue | 455.1 | $ 420.3 | 1,328.0 | $ 1,273.4 |  |  |
Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | 115.0 | (48.7) | 67.2 | 162.2 |  |  |
Trade and other non-current payables | 120.3 |  | 120.3 |  | 50.6 | [1] |
Trade and other current payables | 335.3 |  | 335.3 |  | 377.1 | [1] |
Nigeria |  |  |  |  |  |  |
Revenue | $ 268.0 | $ 242.3 | $ 799.7 | $ 739.6 |  |  |
Restatement amount |  |  |  |  |  |  |
Property, plant and equipment. |  |  |  |  | (30.5) |  | $ (30.5)
Deferred tax liabilities |  |  |  |  | (11.9) |  | (11.9)
Retained earnings |  |  |  |  | (18.6) |  | $ (18.6)
Restatement amount | Nigeria |  |  |  |  |  |  |
Trade and other non-current payables |  |  |  |  | 45.4 |  |
Trade and other current payables |  |  |  |  | $ (45.4) |  |
[1] | September 30,

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