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Components of Net Periodic Benefit Cost
 6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of Net Periodic Benefit Cost
Pension Benefits
Three months ended June 30,Six months ended June 30,
2023202220232022
Service cost$0.1 $1.0 $1.1 $2.1 
Interest cost4.4 2.6 7.0 5.1 
Expected return on plan assets(1.7)(5.9)(7.5)(11.7)
Amortization of prior service costs— 0.1 0.1 0.1 
Amortization of net loss2.4 1.0 3.2 1.7 
Net periodic benefit cost (income)$5.2 $(1.2)$3.9 $(2.7)
Other Postretirement Benefits
Three months ended June 30,Six months ended June 30,
2023202220232022
Service cost$0.0 $0.0 $0.1 $0.1 
Interest cost1.2 0.6 1.9 1.3 
Amortization of prior service cost— (0.5)— (1.0)
Amortization of net loss(0.2)0.3 0.1 0.8 
Net periodic benefit cost$1.0 $0.4 $2.1 $1.2