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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2024
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information Quarterly financial data (unaudited) were as follows (dollars in millions, except per share data):
Three months ended
2024March 31June 30September 30December 31
Revenues$1,156.5 $1,066.2 $1,129.6 $1,097.2 
Income before income taxes
$146.2 $150.6 $11.0 $210.5 
Income tax expense
33.9 34.3 1.7 44.4 
Net income
$112.3 $116.3 $9.3 $166.1 
Earnings per common share:
Basic:
Net income
$1.03 $1.08 $0.09 $1.62 
Diluted:
Net income
$1.01 $1.06 $0.09 $1.58 
2023March 31June 30September 30December 31
Revenues$1,006.0 $1,022.8 $947.5 $1,170.5 
(Loss) income before income taxes
$(1.0)$96.1 $215.6 $46.1 
Income tax (benefit) expense
(0.2)22.4 48.3 9.8 
Net (loss) income
$(0.8)$73.7 $167.3 $36.3 
Earnings per common share:
Basic:
Net (loss) income
$(0.01)$0.64 $1.48 $0.33 
Diluted:
Net (loss) income
$(0.01)$0.64 $1.46 $0.32