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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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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.

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