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Equity Incentive Schemes and Stock Compensation Charges - Outstanding and Exercisable Share Options (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum Range Exercise Price (USD per share) | $ 14.88 |  |  |
Maximum Range Exercise Price (USD per share) | 231.68 |  |  |
Range 1 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum Range Exercise Price (USD per share) | 14.88 |  |  |
Maximum Range Exercise Price (USD per share) | 96.15 |  |  |
Range 2 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum Range Exercise Price (USD per share) | 103.81 |  |  |
Maximum Range Exercise Price (USD per share) | 124.00 |  |  |
Range 3 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum Range Exercise Price (USD per share) | 125.74 |  |  |
Maximum Range Exercise Price (USD per share) | 147.26 |  |  |
Range 4 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum Range Exercise Price (USD per share) | 159.33 |  |  |
Maximum Range Exercise Price (USD per share) | $ 231.68 |  |  |
Stock Option and Award Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Shares (in shares) | 1,378,119 |  |  |
Weighted Average Remaining Contractual Life | 4 years 8 months 8 days |  |  |
Weighted average exercise price (USD per share) | $ 119.86 | $ 110.38 | $ 108.53 | $ 87.80
Number of Shares (in shares) | 1,047,803 |  |  |
Vested and exercisable at end of period (USD per share) | $ 102.29 |  |  |
Stock Option and Award Plans | Range 1 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Shares (in shares) | 494,565 |  |  |
Weighted Average Remaining Contractual Life | 2 years 8 months 12 days |  |  |
Number of Shares (in shares) | 494,565 |  |  |
Stock Option and Award Plans | Range 2 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Shares (in shares) | 226,489 |  |  |
Weighted Average Remaining Contractual Life | 5 years 6 months 29 days |  |  |
Number of Shares (in shares) | 203,605 |  |  |
Stock Option and Award Plans | Range 3 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Shares (in shares) | 386,518 |  |  |
Weighted Average Remaining Contractual Life | 5 years 7 months 24 days |  |  |
Number of Shares (in shares) | 303,054 |  |  |
Stock Option and Award Plans | Range 4 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Shares (in shares) | 270,547 |  |  |
Weighted Average Remaining Contractual Life | 6 years 2 months 26 days |  |  |
Number of Shares (in shares) | 46,579 |  |  |

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