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Derivative Instruments and Hedging Activities (Tables)
3 Months Ended
Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Gains or Losses Recognized in AOCI for the Cash Flow Hedges
The following tables provide information concerning gains recognized in AOCL for the cash flow hedges for the three months ended March 31, 2024 and 2023:
Three months ended
March 31,
20242023
InterestInterest
$ in millions (net of tax)Rate HedgeRate Hedge
Beginning accumulated derivative gains in AOCL$11.2 $12.0 
Net gains reclassified to earnings
Interest expense(0.2)(0.2)
Ending accumulated derivative gains in AOCL$11.0 $11.8 
Portion expected to be reclassified to earnings in the next twelve months$(0.8)