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Commitments and Contingencies (Tables)
12 Months Ended
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments for Non-Cancellable Operating Leases

The following are future minimum lease payments for non-cancellable operating leases having a remaining term in excess of one year at 31 March 2015:

 

 Years ending 31 March (Millions of US dollars):     

2016

  $ 13.7     

2017

  10.3     

2018

  9.1     

2019

  7.0     

2020

  5.5     

Thereafter

  11.7     
  

 

 

 

Total

  $       57.3