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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment activity, additional disclosures [Abstract]
Document Period End Date					Jun. 30, 2020
Restricted Stock Units (RSUs)
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,208,900	1,532,300	434,300	559,600	1,532,300	559,600	559,600
Granted (in shares)	152,300		37,400		162,000.0	112,100
Vested (in shares)	(10,200)		(26,600)		(334,800)	(222,100)
Forfeited (in shares)	(7,800)		(8,400)		(16,300)	(12,900)
Unvested at end of period (in shares)	1,343,200	1,208,900	436,700	434,300	1,343,200	436,700	1,532,300	559,600
Performance Shares [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	286,800	286,800	92,700	93,100	286,800	93,100	93,100
Granted (in shares)	272,000.0		166,900		272,000.0	166,900
Vested (in shares)	0		0		0	0
Forfeited (in shares)	0		0		0	(400)
Unvested at end of period (in shares)	558,800	286,800	259,600	92,700	558,800	259,600	286,800	93,100
Share-based Payment Arrangement [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,495,700	1,819,100	527,000.0	652,700	1,819,100	652,700	652,700
Granted (in shares)	424,300		204,300		434,000.0	279,000.0
Vested (in shares)	(10,200)		(26,600)		(334,800)	(222,100)
Forfeited (in shares)	(7,800)		(8,400)		(16,300)	(13,300)
Unvested at end of period (in shares)	1,902,000.0	1,495,700	696,300	527,000.0	1,902,000.0	696,300	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)	$ 144.71	$ 141.51	$ 140.55	$ 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	113.67		150.03		118.66	150.78
Weighted average grant date fair value, vested (in dollars per share)	118.91		118.02		136.36	115.17
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	143.09		136.19		140.22	132.56
Weighted average grant date fair value, end of period (in dollars per share)	$ 137.93	$ 144.71	$ 144.17	$ 140.55	$ 137.93	$ 144.17	$ 141.51	$ 131.32
Weighted average remaining contractual life, unvested shares outstanding	2 years 3 days	1 year 9 months 10 days	2 years 3 months	2 years 1 month 24 days	2 years 3 days	2 years 3 months	2 years 4 months 20 days	2 years 7 days
Unamortized deferred compensation cost	$ 122.4				$ 122.4
HFF Acquisition [Member] | Share-based Payment Arrangement [Member]
Share-based Payment activity, additional disclosures [Abstract]
Unamortized deferred compensation cost	$ 50.8				$ 50.8

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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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