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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
Changes in each component of "Accumulated other comprehensive (loss) income," net of tax, during 2023, 2022 and 2021 were as follows:
  (dollars in millions)
Foreign Currency Translation AdjustmentsPension and Post-retirement Plans
Available-for-Sale Debt Securities
Derivative Financial Instrument RevaluationAccumulated Other Comprehensive (Loss) Income
Balance at December 31, 2020$(138.8)$(3.2)$— $(52.8)$(194.8)
Other comprehensive (loss) income before reclassifications, net(30.6)2.9 — 6.2 (21.5)
Reclassifications, pretax— — — 18.9 18.9 
Balance at December 31, 2021(169.4)(0.3)— (27.7)(197.4)
Other comprehensive (loss) income before reclassifications, net(146.3)(5.2)1.1 48.2 (102.2)
Reclassifications, pretax— — — 1.5 1.5 
Balance at December 31, 2022(315.7)(5.5)1.1 22.0 (298.1)
Other comprehensive (loss) income before reclassifications, net(25.5)3.4 (1.1)2.9 (20.3)
Reclassifications, pretax— — — (35.9)(35.9)
Tax benefit reclassified— — — 8.4 8.4 
Balance at December 31, 2023$(341.2)$(2.1)$— $(2.6)$(345.9)