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Benefit Plans
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
Components of net periodic benefit expense for our pension plans for the three and nine months ended September 30, 2024 and 2023 were as follows:
Three months endedNine months ended
In millionsSeptember 30,
2024		September 30,
2023		September 30,
2024		September 30,
2023
Service cost$0.4 $0.4 $1.2 $1.2 
Interest cost1.0 1.0 3.0 3.0 
Expected return on plan assets(0.1)(0.2)(0.3)(0.6)
Net periodic benefit expense$1.3 $1.2 $3.9 $3.6 
Components of net periodic benefit expense for our other post-retirement plans for the three and nine months ended September 30, 2024 and 2023 were not material