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OTHER COMPREHENSIVE INCOME/(LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income/(Loss) | The components of accumulated other comprehensive income/(loss) were as follows:
| Three months ended September 30, 2025 |  | Three months ended September 30, 2024 |  |  |
(in millions) | Foreign currency translation |  | Employee benefit plans |  |  |  |  |  | Total |  | Foreign currency translation |  | Employee benefit plans |  | Total |  |  |  |  |  |  |
Other comprehensive income/(loss), net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation differences on investments in foreign subsidiaries | $ | (72.4) |  |  | $ | — |  |  |  |  |  |  | $ | (72.4) |  |  | $ | 184.7 |  |  | $ | — |  |  | $ | 184.7 |  |  |  |  |  |  |  |
Other comprehensive income/(loss), net | — |  |  | 0.9 |  |  |  |  |  |  | 0.9 |  |  | — |  |  | 0.6 |  |  | 0.6 |  |  |  |  |  |  |  |
Other comprehensive income/(loss), net of tax | (72.4) |  |  | 0.9 |  |  |  |  |  |  | (71.5) |  |  | 184.7 |  |  | 0.6 |  |  | 185.3 |  |  |  |  |  |  |  |
Beginning balance on July 1 | (534.5) |  |  | (129.7) |  |  |  |  |  |  | (664.2) |  |  | (792.2) |  |  | (129.7) |  |  | (921.9) |  |  |  |  |  |  |  |
Other comprehensive income/(loss), net of tax | (72.4) |  |  | 0.9 |  |  |  |  |  |  | (71.5) |  |  | 184.7 |  |  | 0.6 |  |  | 185.3 |  |  |  |  |  |  |  |
Ending balance on September 30 | $ | (606.9) |  |  | $ | (128.8) |  |  |  |  |  |  | $ | (735.7) |  |  | $ | (607.5) |  |  | $ | (129.1) |  |  | $ | (736.6) |  |  |  |  |  |  |  |
| Nine months ended September 30, 2025 |  | Nine months ended September 30, 2024 |  |  |
(in millions) | Foreign currency translation |  | Employee benefit plans |  |  |  |  |  | Total |  | Foreign currency translation |  | Employee benefit plans |  | Total |  |  |  |  |  |  |
Other comprehensive income/(loss), net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation differences on investments in foreign subsidiaries | $ | 297.5 |  |  | $ | — |  |  |  |  |  |  | $ | 297.5 |  |  | $ | 62.6 |  |  | $ | — |  |  | $ | 62.6 |  |  |  |  |  |  |  |
Other comprehensive income/(loss), net | — |  |  | 2.9 |  |  |  |  |  |  | 2.9 |  |  | — |  |  | 2.6 |  |  | 2.6 |  |  |  |  |  |  |  |
Other comprehensive income/(loss), net of tax | 297.5 |  |  | 2.9 |  |  |  |  |  |  | 300.4 |  |  | 62.6 |  |  | 2.6 |  |  | 65.2 |  |  |  |  |  |  |  |
Beginning balance on January 1 | (904.4) |  |  | (131.7) |  |  |  |  |  |  | (1,036.1) |  |  | (670.1) |  |  | (131.7) |  |  | (801.8) |  |  |  |  |  |  |  |
Other comprehensive income/(loss), net of tax | 297.5 |  |  | 2.9 |  |  |  |  |  |  | 300.4 |  |  | 62.6 |  |  | 2.6 |  |  | 65.2 |  |  |  |  |  |  |  |
Ending balance on September 30 | $ | (606.9) |  |  | $ | (128.8) |  |  |  |  |  |  | $ | (735.7) |  |  | $ | (607.5) |  |  | $ | (129.1) |  |  | $ | (736.6) |  |  |  |  |  |  |  |

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