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Pension and Postretirement Health and Life Benefits (Tables)
 6 Months Ended
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic benefit costs (credits) for the defined benefit pension plans were as follows (in millions):
Three Months Ended 
 June 30,		Six Months Ended 
 June 30,
2024202320242023
Service costs$0.5 $0.8 $1.0 $1.5 
Interest costs3.8 6.9 7.6 13.9 
Amortization of prior service costs (credits), net— — (0.1)(0.1)
Remeasurement gain
(16.6)— (16.6)— 
Expected return on plan assets (gains)(4.7)(7.8)(9.3)(15.5)
Net periodic benefit costs (credits)
$(17.0)$(0.1)$(17.4)$(0.2)


The components of net periodic benefit costs for the postretirement health and life benefit plan were as follows (in millions):
Three Months Ended 
 June 30,		Six Months Ended 
 June 30,
2024202320242023
Interest costs$1.1 $1.3 $2.2 $2.5 
Net periodic benefit costs$1.1 $1.3 $2.2 $2.5