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Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 30, 2012 shares | Dec. 31, 2020 USD ($) Installment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares
Modified Award [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Phantom shares vested | shares |  |  | 600,719 |  |
Restricted Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of annual installments | Installment |  |  | 3 |  |
Weighted Average Grant Date Fair Value Per, Granted |  |  | $ 149.38 | $ 96.59 | $ 91.85
Weighted average grant date fair value per, vested | $ |  |  | $ 11.9 | $ 7.3 | $ 6.2
Unrecognized stock-based compensation cost | $ |  |  | $ 9.9 |  |
Unrecognized compensation costs, weighted-average recognition periods |  |  | 1 year 8 months 12 days |  |
Phantom shares vested | shares |  |  | 80,349 |  |
Unvested Weighted Average grant date fair value |  |  | $ 121.53 | $ 90.65 |
PBRSUs [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted Average Grant Date Fair Value Per, Granted | [1] |  | $ 146.29 |  |
Unrecognized stock-based compensation cost | $ |  |  | $ 1.9 |  |
Unrecognized compensation costs, weighted-average recognition periods |  |  | 2 years 1 month 6 days |  |
Unvested Weighted Average grant date fair value |  |  | $ 146.29 |  |
Phantom Stock Plan [Member] | Modified Award [Member] | ASU 2017-09 [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted Average Grant Date Fair Value Per, Granted |  |  |  | $ 120.41 |
Share based compensation outstanding number | shares |  |  |  | 613,996 |
Vested Phantom Stock Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Weighted Average Grant Date Fair Value Per, Granted |  |  | 120.56 |  |
Phantom Share Units (PSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  | 1,500,000 |  |  |
Share-based compensation arrangement vesting increment percentage |  | 20.00% |  |  |
Share based compensation arrangement, employment period for eligibility of employees participation |  | 10 years |  |  |
Unvested Weighted Average grant date fair value |  |  | $ 113.65 |  |
Liability for unsettled stock awards | $ |  |  | $ 0.0 |  |
Stock Incentive Plan 2016 [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  |  | 3,000,000 |  |
[1] | Amount represents PBRSUs granted at target. PBRSUs earned may range from zero to 200% of the target award. Actual PBRSUs earned for the 2020 performance period, as determined by the Compensation Committee, were equal to the target amount.

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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