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Share-based compensation - Range of exercise prices in SARs and TSARs (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
SARs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 2 years 5 months 1 day |  |
Number of units outstanding (in units) | shares | 666,256 | 840,772 | 857,407
Weighted average exercise price of units outstanding (in usd per unit) | $ 45.70 | $ 50.61 | $ 52.02
Number of units exercisable (in units) | shares | 553,902 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 47.91 |  |
SARs | $29.27 to $35.51 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 2 years 9 months 18 days |  |
Number of units outstanding (in units) | shares | 228,520 |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 32.42 |  |
Number of units exercisable (in units) | shares | 164,410 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 33.65 |  |
SARs | $29.27 to $35.51 | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | 29.27 |  |
SARs | $29.27 to $35.51 | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 35.51 |  |
SARs | $38.24 to $50.17 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 3 years 2 months 8 days |  |
Number of units outstanding (in units) | shares | 154,606 |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 47.25 |  |
Number of units exercisable (in units) | shares | 115,116 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 50.15 |  |
SARs | $38.24 to $50.17 | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | 38.24 |  |
SARs | $38.24 to $50.17 | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 50.17 |  |
SARs | $54.65 to $78.59 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 1 year 8 months 8 days |  |
Number of units outstanding (in units) | shares | 283,130 |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 55.58 |  |
Number of units exercisable (in units) | shares | 274,376 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 55.52 |  |
SARs | $54.65 to $78.59 | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | 54.65 |  |
SARs | $54.65 to $78.59 | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 78.59 |  |
TSARs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 3 years 10 months 2 days |  |
Number of units outstanding (in units) | shares | 2,380,237 | 2,340,490 | 1,661,327
Weighted average exercise price of units outstanding (in usd per unit) | $ 42.05 | $ 45.43 | $ 52.55
Number of units exercisable (in units) | shares | 1,436,377 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 46.33 |  |
TSARs | $29.27 to $35.51 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 4 years 1 month 20 days |  |
Number of units outstanding (in units) | shares | 1,014,664 |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 30.64 |  |
Number of units exercisable (in units) | shares | 507,288 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 32.00 |  |
TSARs | $29.27 to $35.51 | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | 29.27 |  |
TSARs | $29.27 to $35.51 | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 35.51 |  |
TSARs | $38.24 to $50.17 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 4 years 4 months 6 days |  |
Number of units outstanding (in units) | shares | 643,244 |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 44.02 |  |
Number of units exercisable (in units) | shares | 297,710 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 49.94 |  |
TSARs | $38.24 to $50.17 | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | 38.24 |  |
TSARs | $38.24 to $50.17 | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 50.17 |  |
TSARs | $54.65 to $78.59 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average remaining contractual life (years) | 2 years 11 months 15 days |  |
Number of units outstanding (in units) | shares | 722,329 |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 56.33 |  |
Number of units exercisable (in units) | shares | 631,379 |  |
Weighted average exercise price of units exercisable (in usd per unit) | $ 56.15 |  |
TSARs | $54.65 to $78.59 | Bottom of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | 54.65 |  |
TSARs | $54.65 to $78.59 | Top of range |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Weighted average exercise price of units outstanding (in usd per unit) | $ 78.59 |  |

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