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Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Table of Performance Share Unit Monte Carlo Assumptions [Table Text Block] |
| 2022 |  | 2021 |  | 2020
Risk-free interest rate | 4.58 | % |  | 0.61 | % |  | 0.18 | %
Expected life in years | 3 |  | 3 |  | 3
Expected volatility | 26 | % |  | 25 | % |  | 26 | %
Expected dividend yield | — |  |  | — |  |  | — |
Schedule of Stock Options, Activity |
| Number of Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2021 | 405,784 |  |  | $ | 512.30 |  |  | $ | 480.8 |
Granted | 17,487 |  |  | 1,228.39 |  |  |
Exercised | (114,641) |  |  | 289.73 |  |  |
Forfeited | (481) |  |  | 1,027.67 |  |  |
Outstanding at December 31, 2022 | 308,149 |  |  | 635.00 |  |  | 250.5 |
Options exercisable at December 31, 2022 | 239,129 |  |  | $ | 503.99 |  |  | $ | 225.3 |
Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range |
Number of Options Outstanding |  | Weighted Average Exercise Price |  | Remaining Contractual Life of Options Outstanding |  | Options Exercisable
140,457 |  |  | $ | 336.92 |  |  | 3.03 |  | 140,457 |
106,807 |  |  | $ | 664.31 |  |  | 5.95 |  | 84,718 |
60,885 |  |  | $ | 1,271.24 |  |  | 8.77 |  | 13,954 |
308,149 |  |  |  |  | 5.51 |  | 239,129 |
Schedule of Stock Options, Valuation Assumptions |
| 2022 |  | 2021 |  | 2020
Risk-free interest rate | 4.35 | % |  | 0.95 | % |  | 0.34 | %
Expected life in years | 6.4 |  | 6.3 |  | 6.0
Expected volatility | 26 | % |  | 25 | % |  | 26 | %
Expected dividend yield | — |  |  | — |  |  | — |
Schedule Restricted Stock Units, Activity |
| Number of Restricted Stock Units |  | Aggregate Intrinsic Value (in millions) |  | Number of Performance Share Units |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2021 | 26,899 |  |  | $45.6 |  | 14,844 |  |  | $25.2
Granted | 8,862 |  |  |  |  | 2,350 |  |  |
Adjustment for performance results achieved(1) | — |  |  |  |  | 4,455 |  |  |
Vested | (9,551) |  |  |  |  | (9,367) |  |  |
Forfeited | (1,318) |  |  |  |  | — |  |  |
Outstanding at December 31, 2022 | 24,892 |  |  | $36.0 |  | 12,282 |  |  | $17.8

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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