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Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Components of net periodic benefit cost for our pension plans for the Second Quarter ended June 30, 2019, and 2018 were as follows:
 
 
Second Quarter
 
Year-to-date
 
 
In millions
2019
 
2018
 
2019
2018
 
 
Net periodic benefit credit
 
 
 
 
 
 
 
 
Interest cost
$
2.7

 
$
2.6

 
$
5.4

$
5.3

 
 
Expected return on plan assets
(3.7
)
 
(4.2
)
 
(7.5
)
(8.6
)
 
 
Amortization of:
 
 
 
 
 
 
 
 
     Net actuarial loss
0.7

 
0.7

 
1.4

1.3

 
 
     Prior service credit
(0.1
)
 
(0.1
)
 
(0.2
)
(0.2
)
 
 
Net periodic benefit credit
$
(0.4
)
 
$
(1.0
)
 
$
(0.9
)
$
(2.2
)
 
 
In respect of defined contribution plans
 
 
 
 
 
 
 
 
Total charge for defined contribution plans
1.2

 
1.2

 
2.4

2.6

 
 
Total charge for pension plans
$
0.8

 
$
0.2

 
$
1.5

$
0.4