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Accumulated Other Comprehensive Loss (Tables)
12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Accumulated other comprehensive loss at the balance sheet dates is comprised of the following:
Pension Plan AdjustmentsOther Postretirement Employee Benefit Plan AdjustmentsTotal
Balance at December 31, 2022
$(46.5)$13.3 $(33.3)
Other comprehensive income (loss) before reclassifications4.5 (1.7)2.8 
Amounts reclassified from accumulated other comprehensive loss0.1 (0.3)(0.2)
   Other comprehensive income (loss), net of tax4.6 (2.0)2.6 
Balance at December 31, 2023
(42.0)11.3 (30.7)
Other comprehensive income (loss) before reclassifications(6.0)2.4 (3.6)
Amounts reclassified from accumulated other comprehensive loss0.1 (0.4)(0.3)
   Other comprehensive income (loss), net of tax(5.9)2.1 (3.8)
Balance at December 31, 2024
$(47.8)$13.4 $(34.5)