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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Restricted Stock Units (RSUs) [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Activity Related to Restricted Share Units | A summary of activity related to restricted share units (“RSUs”) during the nine-month period ended September 30, 2020, is presented below: ​
​ | ​ | ​
​ |  | Unvested Shares
Outstanding at December 31, 2019 |  | 861,012
Granted |  | 326,045
Forfeited |  | (33,181)
Vested and issued |  | (375,368)
Outstanding at September 30, 2020 |  | 778,508
Performance Shares [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Performance-Based Restricted Share Units Activity and Related Information | A summary of activity related to performance-based restricted share units (“PSUs”) during the nine-month period ended September 30, 2020, is presented below: ​
​ | ​ | ​
​ |  | Unvested Shares
Outstanding at December 31, 2019 |  | 504,484
Granted |  | 211,987
Forfeited |  | (727)
Vested and issued |  | (281,186)
Outstanding at September 30, 2020 |  | 434,558
Deferred Share Units [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Activity Related to Restricted Share Units | A summary of activity related to deferred share units (“DSUs”) during the nine-month period ended September 30, 2020, is presented below: ​
​ | ​ | ​
​ |  | Vested Shares
Outstanding at December 31, 2019 |  | 18,970
Granted |  | 2,616
Outstanding at September 30, 2020 |  | 21,586
Progressive Waste Solutions Ltd. [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Option Activity and Related Information | ​
​ | ​ | ​
Outstanding at December 31, 2019 |  | 126,161
Cash settled |  | (74,461)
Outstanding at September 30, 2020 |  | 51,700
Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Activity Related to Restricted Share Units | ​
​ | ​ | ​
Outstanding at December 31, 2019 |  | 73,884
Cash settled |  | (7,330)
Outstanding at September 30, 2020 |  | 66,554

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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