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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Net periodic cost (benefit) for the FPU Pension Plan for the three and six months ended June 30, 2025 and 2024 is set forth in the following table:
Three Months EndedSix Months Ended
June 30,June 30,
2025202420252024
(in millions)  
Interest cost$0.6 $0.6 $1.2 $1.2 
Expected return on plan assets(0.7)(0.7)(1.4)(1.4)
Amortization of net loss— 0.1 — 0.1 
Total periodic benefit$(0.1)$— $(0.2)$(0.1)