SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - RSUs, DSUs and ESPP (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	0	0	484,956	0
Award vesting period			3 years
Unrecognized compensation cost relating to unvested stock awards	$ 16.2		$ 16.2
Unvested stock awards compensation cost, weighted average recognition period			2 years 2 months 12 days
Stock issued (in shares)	0	0	0	0
Deferred Share Units (DSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)	72,903	70,609	76,570	74,408
Stock issued (in shares)	0	0	0	0
Employee Share Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards purchase price discount			15.00%
Common shares eligible for issuance (in shares)	166,635	139,462	367,407	327,543
Cash received from employee stock purchase plan	$ 6.5	$ 5.2	$ 13.7	$ 11.7

Cash collected to be used to purchase Common Stock in future periods

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price Discount

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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