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Pension and Postretirement Health and Life Benefits (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31,
20242023
Service costs$0.5 $0.7 
Interest costs3.8 7.0 
Amortization of prior service costs (credits), net(0.1)(0.1)
Expected return on plan assets (gains)(4.6)(7.7)
Net periodic benefit costs (credits)
$(0.4)$(0.1)


The components of net periodic benefit costs for the postretirement health and life benefit plan were as follows (in millions):
Three Months Ended 
 March 31,
20242023
Interest costs$1.1 $1.2 
Net periodic benefit costs$1.1 $1.2