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Pension and Postretirement Health and Life Benefits (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits, Description [Abstract]  
Schedule of Net Benefit Costs
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,
2025202420252024
Service costs$0.1 $0.5 $0.2 $1.0 
Interest costs0.4 3.8 0.8 7.6 
Amortization of prior service costs (credits), net(0.1)— (0.1)(0.1)
Remeasurement gain
— (16.6)— (16.6)
Expected return on plan assets (gains)(0.4)(4.7)(0.9)(9.3)
Net periodic benefit costs (credits)
$— $(17.0)$— $(17.4)


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,
2025202420252024
Interest costs$1.1 $1.1 $2.2 $2.2 
Net periodic benefit costs$1.1 $1.1 $2.2 $2.2