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Stock-based Compensation (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Document Period End Date | Mar. 31, 2020 |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 1,532,300 |  | 559,600 |
Granted (in shares) | 9,700 |  | 74,700 |
Vested (in shares) | 324,600 |  | 195,500 |
Forfeited (in shares) | (8,500) |  | (4,500) |
Unvested at end of period (in shares) | 1,208,900 | 1,532,300 | 434,300 | 559,600
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Weighted average grant date fair value, beginning of period (in dollars per share) | $ 141.51 |  | $ 131.32 |
Weighted average grant date fair value, end of period (in dollars per share) |  | $ 141.51 |  | $ 131.32
Weighted average remaining contractual life, unvested shares outstanding |  | 2 years 4 months 20 days |  | 2 years 7 days
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Adjustment Amount | $ 5,500,000 |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 286,800 |  | 93,100 |
Granted (in shares) | 0 |  | 0 |
Vested (in shares) | 0 |  | 0 |
Forfeited (in shares) | 0 |  | (400) |
Unvested at end of period (in shares) | 286,800 | 286,800 | 92,700 | 93,100
Share-based Payment Arrangement [Member] |  |  |  |
Restricted stock unit activity [Roll Forward] |  |  |  |
Unvested at beginning of period (in shares) | 1,819,100 |  | 652,700 |
Granted (in shares) | 9,700 |  | 74,700 |
Vested (in shares) | 324,600 |  | 195,500 |
Forfeited (in shares) | (8,500) |  | (4,900) |
Unvested at end of period (in shares) | 1,495,700 | 1,819,100 | 527,000.0 | 652,700
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 160.03 |  | $ 152.84 |
Weighted average grant date fair value, vested (in dollars per share) | 136.91 |  | 114.79 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | 137.68 |  | 126.70 |
Weighted average grant date fair value, end of period (in dollars per share) | $ 144.71 |  | $ 140.55 |
Weighted average remaining contractual life, unvested shares outstanding | 1 year 9 months 10 days |  | 2 years 1 month 24 days |
Unamortized deferred compensation cost | $ 107,200,000 |  |  |
HFF Acquisition [Member] | Share-based Payment Arrangement [Member] |  |  |  |
Restricted stock unit activity, additional disclosures [Abstract] |  |  |  |
Unamortized deferred compensation cost | $ 66,900,000 |  |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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