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Components of Net Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of net periodic benefit cost
Pension Benefits
Three months ended June 30,Six months ended June 30,
2024202320242023
Service cost$0.7 $0.1 $1.3 $1.1 
Interest cost3.2 4.4 6.7 7.0 
Expected return on plan assets(4.1)(1.7)(7.9)(7.5)
Amortization of prior service costs— — 0.1 0.1 
Amortization of net loss1.3 2.4 3.0 3.2 
Net periodic benefit cost (income)$1.1 $5.2 $3.2 $3.9 
Other Postretirement Benefits
Three months ended June 30,Six months ended June 30,
2024202320242023
Service cost$0.1 $— $0.1 $0.1 
Interest cost0.9 1.2 1.9 1.9 
Amortization of prior service cost(0.1)— (0.1)— 
Amortization of net loss0.3 (0.2)0.3 0.1 
Net periodic benefit cost$1.2 $1.0 $2.2 $2.1