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Range of Exercise Prices for Options Outstanding (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 shares $ / shares | Dec. 31, 2021 shares $ / shares $ / shares | Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2019 shares $ / shares
Canadian Share Options [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 115,605 | 115,605 | 115,605 | 148,665 | 148,665 | 201,079 | 201,079
Total options outstanding, Weighted average exercise price | $ 123.35 | $ 123.35 |  | $ 138.86 |  | $ 145.88 |
Options exercisable, Number | shares | 115,605 | 115,605 | 115,605 | 141,156 | 141,156 | 178,453 | 178,453
Canadian Share Options [Member] | 87.00 – 117.59 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 45,590 | 45,590 | 45,590 |  |  |  |
Total options outstanding, Weighted average exercise price | $ 88.11 | $ 88.11 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 2 years 1 month 20 days | 2 years 1 month 20 days |  |  |  |  |
Options exercisable, Number | shares | 45,590 | 45,590 | 45,590 |  |  |  |
Options exercisable, Weighted average exercise price | $ 88.11 | $ 88.11 |  |  |  |  |
Canadian Share Options [Member] | 87.00 – 117.59 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | 117.59 |  |  |  |  |  |
Canadian Share Options [Member] | 87.00 – 117.59 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | $ 87.00 |  |  |  |  |  |
Canadian Share Options [Member] | 117.60 – 146.19 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 17,035 | 17,035 | 17,035 |  |  |  |
Total options outstanding, Weighted average exercise price | $ 145.97 | $ 145.97 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 2 years 1 month 17 days | 2 years 1 month 17 days |  |  |  |  |
Options exercisable, Number | shares | 17,035 | 17,035 | 17,035 |  |  |  |
Options exercisable, Weighted average exercise price | $ 145.97 | $ 145.97 |  |  |  |  |
Canadian Share Options [Member] | 117.60 – 146.19 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | 146.19 |  |  |  |  |  |
Canadian Share Options [Member] | 117.60 – 146.19 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | $ 117.60 |  |  |  |  |  |
Canadian Share Options [Member] | 146.20 – 146.40 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 52,980 | 52,980 | 52,980 |  |  |  |
Total options outstanding, Weighted average exercise price | $ 146.40 | $ 146.40 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 1 month 9 days | 1 month 9 days |  |  |  |  |
Options exercisable, Number | shares | 52,980 | 52,980 | 52,980 |  |  |  |
Options exercisable, Weighted average exercise price | $ 146.40 | $ 146.40 |  |  |  |  |
Canadian Share Options [Member] | 146.20 – 146.40 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | 146.40 |  |  |  |  |  |
Canadian Share Options [Member] | 146.20 – 146.40 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | $ 146.20 |  |  |  |  |  |
Canadian Share Options [Member] | 87.00 – 146.40 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 115,605 | 115,605 | 115,605 |  |  |  |
Total options outstanding, Weighted average exercise price | $ 123.35 | $ 123.35 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 1 year 2 months 15 days | 1 year 2 months 15 days |  |  |  |  |
Options exercisable, Number | shares | 115,605 | 115,605 | 115,605 |  |  |  |
Options exercisable, Weighted average exercise price | $ 123.35 | $ 123.35 |  |  |  |  |
Canadian Share Options [Member] | 87.00 – 146.40 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | 146.40 |  |  |  |  |  |
Canadian Share Options [Member] | 87.00 – 146.40 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices | $ 87.00 |  |  |  |  |  |
U.S. Share Options [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 267,843 | 267,843 | 267,843 | 283,793 | 283,793 | 318,153 | 318,153
Total options outstanding, Weighted average exercise price |  |  | $ 80.43 |  | $ 86.23 |  | $ 93.32
Options exercisable, Number | shares | 257,854 | 257,854 | 257,854 | 239,521 | 239,521 | 217,441 | 217,441
U.S. Share Options [Member] | 51.20 – 66.50 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 103,035 | 103,035 | 103,035 |  |  |  |
Total options outstanding, Weighted average exercise price |  |  | $ 60.42 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 2 years 7 days | 2 years 7 days |  |  |  |  |
Options exercisable, Number | shares | 93,046 | 93,046 | 93,046 |  |  |  |
Options exercisable, Weighted average exercise price |  |  | $ 61.41 |  |  |  |
U.S. Share Options [Member] | 51.20 – 66.50 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 66.50 |  |  |  |  |
U.S. Share Options [Member] | 51.20 – 66.50 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 51.20 |  |  |  |  |
U.S. Share Options [Member] | 66.51 – 105.94 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 78,323 | 78,323 | 78,323 |  |  |  |
Total options outstanding, Weighted average exercise price |  |  | $ 70.69 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 3 years 18 days | 3 years 18 days |  |  |  |  |
Options exercisable, Number | shares | 78,323 | 78,323 | 78,323 |  |  |  |
Options exercisable, Weighted average exercise price |  |  | $ 70.69 |  |  |  |
U.S. Share Options [Member] | 66.51 – 105.94 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 105.94 |  |  |  |  |
U.S. Share Options [Member] | 66.51 – 105.94 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 66.51 |  |  |  |  |
U.S. Share Options [Member] | 105.95 – 115.80 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 86,485 | 86,485 | 86,485 |  |  |  |
Total options outstanding, Weighted average exercise price |  |  | $ 113.08 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 1 year 4 months 17 days | 1 year 4 months 17 days |  |  |  |  |
Options exercisable, Number | shares | 86,485 | 86,485 | 86,485 |  |  |  |
Options exercisable, Weighted average exercise price |  |  | $ 113.08 |  |  |  |
U.S. Share Options [Member] | 105.95 – 115.80 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 115.80 |  |  |  |  |
U.S. Share Options [Member] | 105.95 – 115.80 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 105.95 |  |  |  |  |
U.S. Share Options [Member] | 51.20 – 115.80 Range of Exercise Prices [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Number | shares | 267,843 | 267,843 | 267,843 |  |  |  |
Total options outstanding, Weighted average exercise price |  |  | $ 80.43 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 2 years 1 month 9 days | 2 years 1 month 9 days |  |  |  |  |
Options exercisable, Number | shares | 257,854 | 257,854 | 257,854 |  |  |  |
Options exercisable, Weighted average exercise price |  |  | $ 81.56 |  |  |  |
U.S. Share Options [Member] | 51.20 – 115.80 Range of Exercise Prices [Member] | Top of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 115.80 |  |  |  |  |
U.S. Share Options [Member] | 51.20 – 115.80 Range of Exercise Prices [Member] | Bottom Of Range [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |
Total options outstanding, Range of exercise prices |  | $ 51.20 |  |  |  |  |

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