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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
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 six-month period ended June 30, 2019, is presented below: ​
​ | ​ | ​
​ |  | Unvested Shares
Outstanding at December 31, 2018 |  | 987,563
Granted |  | 340,198
Forfeited |  | (32,035)
Vested and issued |  | (407,050)
Outstanding at June 30, 2019 |  | 888,676
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 six-month period ended June 30, 2019, is presented below: ​
​ | ​ | ​
​ |  | Unvested Shares
Outstanding at December 31, 2018 |  | 532,086
Granted |  | 152,656
Vested and issued |  | (180,258)
Outstanding at June 30, 2019 |  | 504,484
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 six-month period ended June 30, 2019, is presented below: ​
​ | ​ | ​
​ |  | Vested Shares
Outstanding at December 31, 2018 |  | 17,176
Granted |  | 3,300
Cash settled |  | (2,010)
Outstanding at June 30, 2019 |  | 18,466
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, 2018 |  | 165,156
Cash settled |  | (7,097)
Outstanding at June 30, 2019 |  | 158,059
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, 2018 |  | 122,259
Cash settled |  | (42,258)
Forfeited |  | (2,352)
Outstanding at June 30, 2019 |  | 77,649
Summary of Vesting Activity Related to RSUs | A summary of vesting activity related to Progressive Waste RSUs during the six-month period ended June 30, 2019, is presented below: ​
​ | ​ | ​
Vested at December 31, 2018 |  | 120,153
Vested over remaining service period |  | 2,106
Cash settled |  | (42,258)
Forfeited |  | (2,352)
Vested at June 30, 2019 |  | 77,649
Progressive Waste Solutions Ltd. [Member] | 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 | ​
​ | ​ | ​
Outstanding at December 31, 2018 |  | 22,791
Cash settled, net of notional dividend |  | (22,791)
Outstanding at June 30, 2019 |  | —

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding restricted stock units that are fully vested and expected to vest. Includes, but is not limited to, unvested restricted stock units for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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