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Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2026
Postretirement Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Periodic Benefit Cost for the Other Postretirement Benefit Plans
The following table sets forth the net periodic benefit cost for the Company’s other postretirement benefit plans. The amounts for the three months ended March 31, 2026 are based on calculations prepared by the Company's actuaries and represent the Company’s best estimate of that period’s proportionate share of the amounts to be recorded for the year ending December 31, 2026.
 Three Months Ended
March 31,
 20262025
Components of net periodic benefit credit:
Interest cost$0.4 $0.5 
Amortization of prior service credit(2.0)(2.1)
Net periodic benefit credit$(1.6)$(1.6)