SHARE-BASED PAYMENTS (Tables)

12 Months Ended

Mar. 31, 2019

Share-based Payment Arrangements [Abstract]

Explanation of effect of share-based payments on entity's profit or loss

The effect of share-based payment arrangements in the consolidated income statement and in the consolidated statement of financial position are as follows as at, and for the years ended March 31:



			Compensation		Balance in the consolidated
				cost	statement of financial position
		2019		2018		2019			2018
Cash-settled share-based compensation:
ESPP	$	8.5	$	7.4	$	—		$	—
DSU		6.3		5.4		(15.5	)		(16.2	)
LTI-DSU		6.6		4.8		(31.6	)		(27.1	)
LTI-TB RSU		6.4		5.2		(11.6	)		(10.0	)
LTI-PSU		26.5		27.6		(47.0	)		(40.7	)
Total cash-settled share-based compensation	$	54.3	$	50.4	$	(105.7	)	$	(94.0	)
Equity-settled share-based compensation:
ESOP	$	6.4	$	4.9	$	(24.8	)	$	(21.3	)
Total equity-settled share-based compensation	$	6.4	$	4.9	$	(24.8	)	$	(21.3	)
Total share-based compensation cost	$	60.7	$	55.3	$	(130.5	)	$	(115.3	)

Disclosure of number and weighted average exercise prices of share options

Summarized information about the Company's ESOP as at March 31, 2019 is as follows:



		Options Outstanding				Options Exercisable
		Weighted
	Number of	average remaining		Weighted		Number of	Weighted
Range of	options	contractual life		average exercise		options	average exercise
exercise prices	outstanding	(years)		price		exercisable	price
$9.69 to $11.02	179,725		0.92	$	10.76	179,725	$	10.76
$14.61 to $16.15	2,755,125		3.63		15.65	1,496,500		15.47
$20.86 to $27.15	3,569,275		5.68		24.56	406,100		22.14
Total	6,504,125		4.68	$	20.41	2,082,325	$	16.36

Outstanding options are as follows:



				2019				2018
			Weighted				Weighted
	Number		average exercise		Number		average exercise
	of options		price		of options		price
Options outstanding, beginning of year	6,155,525		$	17.31	5,541,625		$	14.51
Granted	1,733,100			27.15	2,044,900			22.15
Exercised	(1,231,600	)		14.78	(1,246,575	)		12.58
Forfeited	(82,525	)		17.41	(184,425	)		18.52
Expired	(70,375	)		18.20	—			—
Options outstanding, end of year	6,504,125		$	20.41	6,155,525		$	17.31
Options exercisable, end of year	2,082,325		$	16.36	1,744,125		$	14.12

Disclosure of range of exercise prices of outstanding share options

Summarized information about the Company's ESOP as at March 31, 2019 is as follows:



		Options Outstanding				Options Exercisable
		Weighted
	Number of	average remaining		Weighted		Number of	Weighted
Range of	options	contractual life		average exercise		options	average exercise
exercise prices	outstanding	(years)		price		exercisable	price
$9.69 to $11.02	179,725		0.92	$	10.76	179,725	$	10.76
$14.61 to $16.15	2,755,125		3.63		15.65	1,496,500		15.47
$20.86 to $27.15	3,569,275		5.68		24.56	406,100		22.14
Total	6,504,125		4.68	$	20.41	2,082,325	$	16.36

Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period

The assumptions used for the purpose of the option calculations outlined in this note are presented below:



		2019			2018
Weighted average assumptions used in the Black-Scholes options pricing model:
Weighted average share price	$	27.42		$	22.14
Exercise price	$	27.15		$	22.15
Dividend yield		1.31	%		1.45	%
Expected volatility		18.34	%		18.39	%
Risk-free interest rate		2.07	%		0.86	%
Expected option term		4 years			4 years
Weighted average fair value option granted	$	4.23		$	2.75

Disclosure of number and weighted average exercise prices of other equity instruments

Long-Term Incentive Performance Based units outstanding are as follows:



			LTI-PSU
	2019		2018
Units outstanding, beginning of year	1,230,717		1,308,064
Units granted	756,386		819,566
Units cancelled	(25,491	)	(50,376	)
Units redeemed	(820,412	)	(846,537	)
Units outstanding, end of year	1,141,200		1,230,717
Units vested, end of year	876,095		933,977

Long-Term Incentive Time Based units outstanding under all plans are as follows:



			LTI-DSU				LTI-TB RSU
	2019		2018		2019		2018
Units outstanding, beginning of year	1,134,741		1,193,723		553,923		551,210
Units granted	—		—		148,670		179,440
Units cancelled	(2,523	)	(1,768	)	(8,487	)	(21,640	)
Units redeemed	(76,750	)	(74,783	)	(192,086	)	(155,087	)
Dividends paid in units	12,575		17,569		—		—
Units outstanding, end of year	1,068,043		1,134,741		502,020		553,923
Units vested, end of year	1,067,648		1,128,464		394,404		420,247

DSUs outstanding are as follows:



	2019		2018
DSUs outstanding, beginning of year	675,097		691,698
Units granted	92,211		99,632
Units redeemed	(253,176	)	(143,560	)
Dividends paid in units	9,338		27,327
DSUs outstanding, end of year	523,470		675,097
DSUs vested, end of the year	523,470		675,097