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Benefit Plans
 9 Months Ended
Sep. 30, 2022
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, 2022 and 2021 were as follows:
Three months endedNine months ended
In millionsSeptember 30,
2022		September 30,
2021		September 30,
2022		September 30,
2021
Service cost$0.6 $0.7 $1.8 $2.1 
Interest cost0.6 0.5 1.8 1.5 
Expected return on plan assets(0.1)(0.1)(0.3)(0.3)
Net periodic benefit expense$1.1 $1.1 $3.3 $3.3 
Components of net periodic benefit expense for our other post-retirement plans for the three and nine months ended September 30, 2022 and 2021 were not material