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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2025 and 2024 is set forth in the following table:
Three Months EndedNine Months Ended
September 30,September 30,
2025202420252024
(in millions)  
Interest cost$0.6 $0.6 $1.8 $1.8 
Expected return on plan assets(0.7)(0.8)(2.1)(2.2)
Amortization of net loss0.1 0.1 0.1 0.2 
Total net periodic benefit$— $(0.1)$(0.2)$(0.2)