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Commitments and Contingencies (Tables)
12 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments for Non-Cancellable Operating Leases
The following are future lease payments for non-cancellable operating leases having a remaining term in excess of one year at 31 March 2018:
Years ending 31 March (Millions of US dollars):
  
2019
$
16.4

2020
14.1

2021
10.8

2022
8.3

2023
6.2

Thereafter
10.8

Total
$
66.6