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v3.20.4

Share-based payments (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Compensation Costs Related to Share-Based Payments | Share-based payments consist of the following compensation costs:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 |  | 2019 |  | 2018
SG&A expenses: | ​ | ​ |  |  | ​ |  |  | ​ |
Stock option compensation expense | ​ | $ | 5,853 | ​ | $ | 4,697 | ​ | $ | 7,895
Equity-classified share units | ​ | ​ | 9,897 | ​ |  | 8,047 | ​ |  | 11,256
Liability-classified share units | ​ | ​ | 3,635 | ​ |  | 1,380 | ​ |  | 1,764
Employee share purchase plan - employer contributions | ​ |  | 2,497 | ​ |  | 2,281 | ​ |  | 2,174
​ | ​ | ​ | 21,882 | ​ | ​ | 16,405 | ​ | ​ | 23,089
Acquisition-related costs: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock option compensation expense | ​ |  | — | ​ |  | — | ​ |  | 357
Share-based continuing employment costs | ​ |  | 802 | ​ | ​ | — | ​ | ​ | —
​ | ​ |  | 802 | ​ | ​ | — | ​ | ​ | 357
​ | ​ | $ | 22,684 | ​ | $ | 16,405 | ​ | $ | 23,446
Summary of Stock Option Activity | Stock option activity for the years ended December 31, 2020, 2019, and 2018 is presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | WA | ​ | ​ | ​
​ | ​ | Common | ​ | WA | ​ | remaining | ​ | Aggregate
​ | ​ | shares under | ​ | exercise | ​ | contractual | ​ | intrinsic
​ |  | option |  | price |  | life (in years) |  | value
Outstanding, December 31, 2017 |  | 4,459,744 |  | $ | 24.29 |  | ​ | 7.5 |  | $ | 17,649
Granted |  | 923,199 |  | ​ | 32.14 |  | ​ |  |  | ​ |
Assumed in acquisition |  | (1,235,154) | ​ |  | 23.10 | ​ |  |  | ​ |  | ​
Exercised |  | (132,624) |  | ​ | 25.91 | ​ | ​ | ​ |  | ​ | 14,808
Forfeited |  | (1,302) |  | ​ | 25.76 | ​ |  |  |  | ​ |
Outstanding, December 31, 2018 |  | 4,013,863 | ​ | $ | 26.41 | ​ |  | 7.2 | ​ | $ | 25,374
Granted |  | 914,068 | ​ |  | 34.03 | ​ |  |  | ​ |  |
Exercised |  | (1,672,022) | ​ |  | 24.58 | ​ | ​ | ​ | ​ | ​ | 27,349
Forfeited |  | (458,092) | ​ |  | 32.15 | ​ |  |  | ​ |  |
Expired | ​ | (628) | ​ | ​ | 24.44 | ​ | ​ | ​ | ​ | ​ | ​
Outstanding, December 31, 2019 |  | 2,797,189 | ​ | $ | 29.05 | ​ |  | 7.1 | ​ | $ | 38,874
Granted |  | 822,626 | ​ |  | 41.94 | ​ |  |  | ​ |  |
Exercised |  | (1,563,941) | ​ |  | 28.22 | ​ | ​ | ​ | ​ | ​ | 37,062
Forfeited |  | (68,056) | ​ |  | 34.30 | ​ |  |  | ​ |  |
Expired |  | (2,064) | ​ |  | 20.74 | ​ |  |  | ​ |  |
Outstanding, December 31, 2020 |  | 1,985,754 | ​ | ​ | 34.95 | ​ |  | 7.7 | ​ | ​ | 68,717
Exercisable, December 31, 2020 |  | 702,443 | ​ | $ | 28.45 | ​ |  | 6.0 | ​ | $ | 28,869
Summary of Share Unit Activity | Share unit activity for the years ended December 31, 2020, 2019, and 2018 is presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Equity-classified awards | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Liability-classified awards
​ | ​ | PSUs | ​ | RSUs | ​ | PSUs(1) | ​ | RSUs | ​ | DSUs
​ | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | ​ | WA grant
​ | ​ | ​ | ​ | date fair | ​ | ​ | ​ | date fair | ​ | ​ | ​ | date fair | ​ | ​ | ​ | date fair | ​ | ​ | ​ | ​ | date fair
​ |  | Number |  | value |  | Number |  | value |  | Number |  | value |  | Number |  | value |  | ​ | Number |  | value
Outstanding, December 31, 2017 |  | 434,248 | ​ | $ | 27.83 |  | 125,152 | ​ | $ | 26.93 |  | 259,241 | ​ | $ | 26.38 |  | 4,666 | ​ | $ | 26.42 |  | ​ | 93,487 | ​ | $ | 26.32
Granted |  | 240,803 | ​ |  | 35.63 |  | 91,251 | ​ |  | 32.10 |  | — | ​ |  | — |  | 66 | ​ |  | 34.70 |  | ​ | 26,553 | ​ |  | 33.42
Transferred to (from) equity awards on modification |  | 257,659 | ​ |  | 31.30 |  | — | ​ |  | — |  | (257,659) | ​ |  | 26.38 |  | — | ​ |  | — |  | ​ | — | ​ |  | —
Vested and settled |  | (212,263) | ​ |  | 33.78 |  | — | ​ |  | — |  | — | ​ |  | — |  | (4,732) | ​ |  | 26.54 |  | ​ | (6,605) | ​ |  | 23.16
Forfeited |  | (50,159) | ​ |  | 31.41 |  | (8,417) | ​ |  | 32.00 |  | (1,582) | ​ |  | 26.45 |  | — | ​ |  | — |  | ​ | — | ​ |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding, December 31, 2018 |  | 670,288 | ​ | $ | 31.46 |  | 207,986 | ​ | $ | 28.99 |  | — | ​ | $ | — |  | — | ​ | $ | — |  | ​ | 113,435 | ​ | $ | 28.16
Granted |  | 170,208 | ​ |  | 36.13 |  | 36,350 | ​ |  | 35.40 |  | — | ​ |  | — |  | — | ​ |  | — |  | ​ | 24,810 | ​ |  | 35.99
Transferred to equity awards on modification |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — |  | — | ​ |  | — |  | ​ | — | ​ |  | —
Vested and settled |  | (251,883) | ​ |  | 30.33 |  | (265) | ​ |  | 31.98 |  | — | ​ |  | — |  | — | ​ |  | — |  | ​ | (19,877) | ​ |  | 27.45
Forfeited |  | (159,889) | ​ |  | 33.21 |  | (6,651) | ​ |  | 34.27 |  | — | ​ |  | — |  | — | ​ |  | — |  | ​ | — | ​ |  | —
Outstanding, December 31, 2019 |  | 428,724 | ​ | $ | 32.89 |  | 237,420 | ​ | $ | 29.72 |  | — | ​ | $ | — |  | — | ​ | $ | — |  | $ | 118,368 | ​ | $ | 29.64
Granted |  | 303,829 | ​ |  | 42.09 |  | 45,781 | ​ |  | 51.36 |  | — | ​ |  | — |  | — | ​ |  | — |  | ​ | 19,146 | ​ |  | 47.01
Vested and settled |  | (156,238) | ​ |  | 31.94 |  | (98,542) | ​ |  | 27.68 |  | — | ​ |  | — |  | — | ​ |  | — |  | ​ | — | ​ |  | —
Forfeited |  | (33,639) | ​ |  | 36.60 |  | (49,722) | ​ |  | 28.14 |  | — | ​ |  | — |  | — | ​ |  | — |  | ​ | — | ​ |  | —
Outstanding, December 31, 2020 |  | 542,676 | ​ | $ | 38.09 |  | 134,937 | ​ | $ | 39.14 |  | — | ​ | $ | — |  | — | ​ | $ | — |  | $ | 137,514 | ​ | $ | 32.06
(1) | Liability-classified PSUs include PSUs awarded under the employee PSU plan and the previous 2013 PSU plan, in place prior to 2015, are cash-settled and not subject to market vesting conditions.
Stock Option Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, |  | 2020 |  | 2019 |  | 2018 |
Risk free interest rate |  | 0.7 | % | 2.5 | % | 2.7 | %
Expected dividend yield |  | 1.96 | % | 2.06 | % | 2.11 | %
Expected lives of the stock options |  | 5 | years | 5 | years | 5 | years
Expected volatility |  | 28.0 | % | 26.8 | % | 28.1 | %
Sign-on Grant Performance Share Unit Plans [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | ​
​ | ​ | ​ | ​
September 11, 2018 |  | 2018 |
Risk free interest rate |  | 2.7 | %
Expected dividend yield |  | 1.53 | %
Expected lives of the PSU |  | 1 | year
Expected volatility |  | 29.2 | %
Performance Share Units, Equity Classified Awards [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | ​
​ | ​ | ​ | ​
Year ended December 31, | ​ | 2018 |
Risk free interest rate | ​ | 1.92 | %
Expected dividend yield | ​ | 2.09 | %
Expected lives of the PSUs | ​ | 3 | years
Expected volatility | ​ | 31.1 | %
Average expected volatility of comparable companies | ​ | 34.1 | %

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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 Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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