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SHARE-BASED PAYMENTS (Tables)
 12 Months Ended
Mar. 31, 2020
Share-based Payment Arrangements [Abstract]  
Explanation of effect of share-based payments on entity's profit or loss
The expense and the carrying amount of liability arising from share-based arrangements are as follows:
 
 
 
 
Carrying
 
 
 
Share-based
 
 
amount of share-based
 
 
payments expense
 
 
payments liabilities
 
 
 
2020

 
2019

 
2020

 
2019

Equity-settled plan
 
 
 
 
 
 
 
 
Stock option plan
$
5.8

$
6.4

 
n.a.

 
n.a.

Cash-settled plans
 
 
 
 
 
 
 
 
Stock purchase plan
 
10.3

 
8.5

$
—

$
—

Deferred share unit (DSU) plans
 
(2.4
)
 
6.3

 
(8.4
)
 
(15.5
)
Restricted share unit (RSU) plans
 
(10.9
)
 
13.0

 
(24.7
)
 
(43.2
)
Performance share unit (PSU) plan
 
(2.9
)
 
26.5

 
(16.2
)
 
(47.0
)
 
$
(0.1
)
$
60.7

$
(49.3
)
$
(105.7
)
Disclosure of number and weighted average exercise prices of share options
Changes in outstanding stock options are as follows:
 
 
 
2020

 
 

 
2019

 
 
Weighted
 
 
 

Weighted
 
 
Number of

average exercise
 
 
Number of

average exercise
 
stock options
 
price
 
 
stock options

price
 
Stock options outstanding, beginning of year
6,504,125

$
20.41

 
6,155,525

$
17.31

Granted
1,320,700

 
34.50

 
1,733,100

 
27.15

Exercised
(1,553,846
)
 
17.06

 
(1,231,600
)
 
14.78

Forfeited
(196,825
)
 
24.17

 
(82,525
)
 
17.41

Expired
(23,300
)
 
10.06

 
(70,375
)
 
18.20

Stock options outstanding, end of year
6,050,854

$
24.25

 
6,504,125

$
20.41

Stock options exercisable, end of year
2,187,379

$
19.05

 
2,082,325

$
16.36
Disclosure of range of exercise prices of outstanding share options
As at March 31, 2020, summarized information about the stock options issued and outstanding is as follows:
 
 

Options Outstanding
 
 
Options Exercisable
 
 
 
Weighted
 
 
 
 
 
Number of

average remaining
Weighted
 
 
Number of

Weighted
 
Range of
stock options

contractual life
average exercise
 
 
stock options

average exercise
 
exercise prices
outstanding

 (years)
price
 
 
exercisable

price
 
$11.02 to $15.14
570,125

 
1.73
$
14.56

 
570,125

$
14.56

$15.34 to $22.26
2,654,704

 
3.77
 
19.68

 
1,308,279

 
19.09

$27.14 to $40.53
2,826,025

 
5.66
 
30.51

 
308,975

 
27.14

Total
6,050,854

 
4.46
$
24.25

 
2,187,379

$
19.05
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period
The assumptions used in the calculation of the fair value of the stock options on the grant date using the Black-Scholes option pricing model are as follows:
 
 
2020

 
2019

Common share price
$
33.94

$
27.42

Exercise price
$
34.50

$
27.15

Dividend yield
 
1.18
%
 
1.31
%
Expected volatility
 
19.70
%
 
18.34
%
Risk-free interest rate
 
1.48
%
 
2.07
%
Expected stock option life
 
4 years

 
4 years
Disclosure of number and weighted average exercise prices of other equity instruments
Changes in outstanding PSUs are as follows:
 
 
 
 
 
2020

 
2019

PSUs outstanding, beginning of year
 
 
 
 
1,141,200

 
1,230,717

Granted
 
 
 
 
730,352

 
756,386

Cancelled
 
 
 
 
(41,991
)
 
(25,491
)
Redeemed
 
 
 
 
(852,688
)
 
(820,412
)
PSUs outstanding, end of year
 
 
 
 
976,873

 
1,141,200

PSUs vested, end of year
 
 
 
 
758,209

 
876,095

Changes in outstanding DSUs are as follows:
 
2020

 
2019

DSUs outstanding, beginning of year
523,470

 
675,097

Granted
79,196

 
92,211

Redeemed
(140,251
)
 
(253,176
)
Dividends paid in DSUs
7,420

 
9,338

DSUs vested and outstanding, end of year
469,835

 
523,470

Changes in outstanding RSUs are as follows:
 
2020

 
2019

RSUs outstanding, beginning of year
1,570,063

 
1,688,664

Granted
149,477

 
148,670

Cancelled
(16,207
)
 
(11,010
)
Redeemed
(228,928
)
 
(268,836
)
Dividends paid in RSUs
16,198

 
12,575

RSUs outstanding, end of year
1,490,603

 
1,570,063

RSUs vested, end of year
1,391,195

 
1,462,052