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Pensions and Postretirement Benefits Other than Pensions (Tables)
 6 Months Ended
Jun. 30, 2024
Pension Plan, Defined Benefit [Member]  
Schedule of Net Periodic Benefit Cost
The components of the Company’s net periodic pension benefit cost for the three and six months ended June 30 were as follows:
Three months endedSix months ended
In millions2024202320242023
Service cost$7.9 $8.9 $16.0 $17.5 
Interest cost28.3 30.1 56.5 59.9 
Expected return on plan assets(29.4)(30.1)(58.8)(60.0)
Net amortization of:
Prior service costs (benefits)0.8 0.8 1.5 1.7 
Net actuarial (gains) losses3.7 4.0 7.5 8.0 
Net periodic pension benefit cost11.3 13.7 22.7 27.1 
Net settlement losses— — — 1.1 
Net periodic pension benefit cost after net settlement losses$11.3 $13.7 $22.7 $28.2 
Amounts recorded in continuing operations:
      Operating income$7.0 $7.9 $14.0 $15.4 
      Other income/(expense), net2.7 4.3 5.4 9.6 
Amounts recorded in discontinued operations1.6 1.5 3.3 3.2 
Total$11.3 $13.7 $22.7 $28.2 
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Schedule of Net Periodic Benefit Cost
The components of net periodic postretirement benefit cost for the three and six months ended June 30 were as follows:
Three months endedSix months ended
In millions2024202320242023
Service cost$0.2 $0.3 $0.5 $0.7 
Interest cost2.9 3.4 5.8 6.7 
Net amortization of:
Prior service costs (benefits)0.2 0.1 0.3 0.3 
Net actuarial (gains) losses(3.3)(3.2)(6.6)(6.5)
Net periodic postretirement benefit cost$— $0.6 $— $1.2 
Amounts recorded in continuing operations:
     Operating income$0.3 $0.3 $0.6 $0.7 
     Other income/(expense), net— 0.4 — 0.7 
Amounts recorded in discontinued operations(0.3)(0.1)(0.6)(0.2)
Total$— $0.6 $— $1.2