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OTHER COMPREHENSIVE INCOME/(LOSS)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
OTHER COMPREHENSIVE INCOME/(LOSS) OTHER COMPREHENSIVE INCOME/(LOSS)
The components of accumulated other comprehensive income/(loss) were as follows:

Three months ended March 31, 2024Three months ended March 31, 2023
(in millions)Foreign currency translationEmployee benefit plansTotalForeign currency translationEmployee benefit plansTotal
Other comprehensive income/(loss), net of tax:
Currency translation differences on investments in foreign subsidiaries
$(96.3)$— $(96.3)$55.1 $— $55.1 
Other comprehensive income/(loss), net— 1.0 1.0 — 4.4 4.4 
Other comprehensive income/(loss), net of tax(96.3)1.0 (95.3)55.1 4.4 59.5 
Beginning balance(670.1)(131.7)(801.8)(815.0)(127.4)(942.4)
Other comprehensive income/(loss), net of tax(96.3)1.0 (95.3)55.1 4.4 59.5 
Ending balance$(766.4)$(130.7)$(897.1)$(759.9)$(123.0)$(882.9)