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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Loss
(Millions of US dollars)
 
Cash Flow
Hedges
 
Pension
Actuarial Gain
 
Foreign
Currency
Translation
Adjustments
 
Total
Balance at 31 March 2019
 
$
0.2

 
$
—

 
$
(30.5
)
 
$
(30.3
)
Other comprehensive gain (loss)
 
—

 
0.8

 
(32.6
)
 
(31.8
)
Balance at 31 March 2020
 
$
0.2

 
$
0.8

 
$
(63.1
)
 
$
(62.1
)