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Share-Based Compensation and Benefit Plans (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) shares $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | May 17, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares | $ 113.46 | $ 98.84 | $ 82.81 |
Total compensation cost for option and share awards | $ 15,300,000 | $ 16,800,000 | $ 17,800,000 |
Total capitalized compensation cost for option and share awards | $ 3,400,000 |  | 3,000,000.0 |
Percentage Of Market Value Per Share At Which Shares Purchased Under Employee Share Purchase Plan | 85.00% |  |  |
EmployeeSharePurchasePlanMaximumAuthorizedAmountPerParticipant | $ 25,000 |  |  |
Share Awards Held In Employee Trust Shares | shares | 1,400,000 | 1,400,000 |  |
Share Awards Held In Non Qualified Deferred Compensation Plan Shares | $ 11,300,000 | $ 12,500,000 |  |
Cash Required By Plan Participants Upon Withdrawal | 16,500,000 | 17,300,000 |  |
Defined Contribution Plan, Cost | $ 3,400,000 | $ 3,100,000 | 2,900,000 |
Employee Share Purchase Program maximum shares available | shares | 500,000 |  |  |
Share Awards Held In Non Qualified Deferred Compensation Plan Shares | shares | 900,000 | 800,000 |  |
Trading Securities Held In Non Qualified Deferred Compensation Plan Value | $ 118,500,000 | $ 139,300,000 |  |
Options [Member] |  |  |  |
Total intrinsic value of options exercised during the period |  |  | 2,000,000.0 |
Share Awards and Vesting [Member] |  |  |  |
Total unrecognized compensation cost related to unvested options which is expected to be amortized | 12,900,000 |  |  |
Fair value of shares vested | $ 18,700,000 | $ 25,500,000 | $ 24,000,000.0 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 2 years |  |  |
Maximum [Member] | Share Awards and Vesting [Member] |  |  |  |
Vesting period, years | 3 years |  |  |
Two Thousand Eighteen Share Incentive Plan [Member] |  |  |  |
Total fungible units to be issued | shares | 7,000,000.0 |  |  | 9,700,000
Fungible Units To Full Value Award Conversion Ratio | 3.45 |  |  |
Full Value award in the fungible unit conversion ratio | shares | 1.0 |  |  |
Expiration value of option right or other award | shares | 1.0 |  |  |
Common shares which could be granted pursuant to full value awards | shares | 2,000,000.0 |  |  |

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- Definition Cash required to be paid to us by plan participants upon the withdrawal of any assets from the trust and is included in accounts receivable - affiliates in our consolidated financial statements. + References No definition available. + Details
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- Definition Common shares which could be granted pursuant to full value awards based on the 3.45 to 1.0 fungible unit-to-full value award conversion ratio. + References No definition available. + Details
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- Definition Maximum authorized purchase amount of shares during any plan year per participant for our employee share purchase plan. + References No definition available. + Details
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- Definition Employee Share Purchase Program maximum shares available under the 2018 ESPP Share plan + References No definition available. + Details
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- Definition The full value award in the fungible unit to full value award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan. + References No definition available. + Details
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- Definition The award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan. + References No definition available. + Details
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- Definition The percentage of market value per share at which shares may be purchased under our employee share purchase plan + References No definition available. + Details
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- Definition The total amount of share awards held in a Rabbi Trust. + References No definition available. + Details
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- Definition The total amount of share awards held in a non-qualified deferred compensation plan. + References No definition available. + Details
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- Definition Equity-based compensation cost during the period with respect to the award, which was recognized in income. + References No definition available. + Details
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- Definition Market value of trading securities held in a rabbi trust. + References No definition available. + Details
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- Definition Market value of trading securities held in a non-qualified deferred compensation plan. + References No definition available. + Details
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- Definition An option, right, or other award which does not deliver the full value at date of grant and expires five years or less from the date of grant counts against the Fungible Pool Limit as this portion of a fungible pool unit + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of cost capitalized for award under share-based payment arrangement. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 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 Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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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