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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment activity, additional disclosures [Abstract]
Document Period End Date					Sep. 30, 2020
Restricted Stock Units (RSUs)
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,343,200	436,700	1,532,300	559,600	1,532,300	559,600	559,600
Granted (in shares)	11,200	1,130,100			173,100	1,243,400
Vested (in shares)	(213,500)	(45,800)			(548,400)	(268,300)
Forfeited (in shares)	(13,000.0)	(8,100)			(29,100)	(21,800)
Unvested at end of period (in shares)	1,127,900	1,512,900	1,343,200	436,700	1,127,900	1,512,900	1,532,300	559,600
Performance Shares [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	558,800	259,600	286,800	93,100	286,800	93,100	93,100
Granted (in shares)	4,400	0			276,400	166,900
Vested (in shares)	0	0			0	0
Forfeited (in shares)	(4,500)	0			(4,500)	(400)
Unvested at end of period (in shares)	558,700	259,600	558,800	259,600	558,700	259,600	286,800	93,100
Share-based Payment Arrangement [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,902,000.0	696,300	1,819,100	652,700	1,819,100	652,700	652,700
Granted (in shares)	15,600	1,130,100			449,500	1,410,300
Vested (in shares)	(213,500)	(45,800)			(548,400)	(268,300)
Forfeited (in shares)	(17,500)	(8,100)			(33,600)	(22,200)
Unvested at end of period (in shares)	1,686,600	1,772,500	1,902,000.0	696,300	1,686,600	1,772,500	1,819,100	652,700
Share-based Payment activity, additional disclosures [Abstract]
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 137.93	$ 144.17	$ 141.51	$ 131.32	$ 141.51	$ 131.32	$ 131.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	107.51	141.14			114.19	149.22
Weighted average grant date fair value, vested (in dollars per share)	140.38	122.48			137.92	116.25
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	134.03	138.96			136.96	134.54
Weighted average grant date fair value, end of period (in dollars per share)	$ 137.49	$ 142.82	$ 137.93	$ 144.17	$ 137.49	$ 142.82	$ 141.51	$ 131.32
Weighted average remaining contractual life, unvested shares outstanding			2 years 3 days	2 years 3 months	1 year 10 months 6 days	2 years 7 months 2 days	2 years 4 months 20 days	2 years 7 days
Unamortized deferred compensation cost	$ 84.3				$ 84.3
HFF Acquisition [Member] | Share-based Payment Arrangement [Member]
Share-based Payment activity, additional disclosures [Abstract]
Unamortized deferred compensation cost	$ 41.5				$ 41.5

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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 YYYY-MM-DD.

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