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OTHER COMPREHENSIVE INCOME
 9 Months Ended
Sep. 30, 2024
Stockholders' Equity Note [Abstract]  
OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME
Comprehensive income comprises two subsets: net earnings and other comprehensive income (OCI). The components of OCI are presented in the accompanying Condensed Consolidated Statements of Comprehensive Income, net of applicable taxes.
Amounts in accumulated other comprehensive income (loss) (AOCI), net of tax, are as follows:
in millionsSeptember 30
2024		December 31
2023		September 30
2023
AOCI   
Cash flow hedges$(18.2)$(19.4)$(19.8)
Pension and postretirement plans(120.6)(124.4)(129.9)
Total$(138.8)$(143.8)$(149.7)
Changes in AOCI, net of tax, for the nine months ended September 30, 2024 are as follows:
in millionsCash Flow
Hedges 		Pension and
Postretirement
Benefit Plans		Total
AOCI
Balances as of December 31, 2023$(19.4)$(124.4)$(143.8)
Amounts reclassified from AOCI1.2 3.8 5.0 
Balances as of September 30, 2024$(18.2)$(120.6)$(138.8)
Amounts reclassified from AOCI to earnings are as follows:
Three Months Ended
September 30		Nine Months Ended
September 30
in millions2024202320242023
Amortization of Accumulated Cash Flow Hedge Losses
Interest expense$0.6 $0.5 $1.7 $1.6 
Benefit from income taxes(0.2)(0.1)(0.5)(0.4)
Total$0.4 $0.4 $1.2 $1.2 
Amortization of Accumulated Benefit Plan Costs
Other nonoperating expense$1.8 $1.8 $5.1 $5.2 
Benefit from income taxes(0.4)(0.5)(1.3)(1.4)
Total$1.4 $1.3 $3.8 $3.8 
Total reclassifications from AOCI to earnings$1.8 $1.7 $5.0 $5.0