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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Rental Expense under Operating Leases
Rental expense under operating leases was as follows:
 
In millions
December 31, 2018
 
December 31, 2017
 
December 31, 2016
 
 
Minimum lease payments under operating leases recognized in the consolidated income statement
$
4.8

 
$
5.1

 
$
4.8

 
Schedule of Future Minimum Rental Payments for Operating Leases
At December 31, 2018, the Company had outstanding commitments for future minimum lease payments under non-cancellable operating leases, principally related to buildings, items of machinery and equipment and motor vehicles, falling due as follows:
 
In millions
 
2019
 
2020
 
2021
 
2022
 
Thereafter
 
Total
 
 
Minimum lease payments
 
$
4.2

 
$
4.1

 
$
3.3

 
$
2.7

 
$
13.1

 
$
27.4