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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, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units (RSUs)
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	940,300	1,096,200	1,208,900	1,532,300	1,096,200	1,532,300	1,532,300
Granted (in shares)	200,500		152,300		257,100	162,000.0
Vested (in shares)	(10,700)		(10,200)		(218,100)	(334,800)
Forfeited (in shares)	(12,000.0)		(7,800)		(17,100)	(16,300)
Unvested at end of period (in shares)	1,118,100	940,300	1,343,200	1,208,900	1,118,100	1,343,200	1,096,200	1,532,300
Performance Shares [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	439,100	531,500	286,800	286,800	531,500	286,800	286,800
Granted (in shares)	107,200		272,000.0		107,200	272,000.0
Vested (in shares)	0		0		(79,000.0)	0
Forfeited (in shares)	(1,100)		0		(14,500)	0
Unvested at end of period (in shares)	545,200	439,100	558,800	286,800	545,200	558,800	531,500	286,800
Share-based Payment Arrangement [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,379,400	1,627,700	1,495,700	1,819,100	1,627,700	1,819,100	1,819,100
Granted (in shares)	307,700		424,300		364,300	434,000.0
Vested (in shares)	(10,700)		(10,200)		(297,100)	(334,800)
Forfeited (in shares)	(13,100)		(7,800)		(31,600)	(16,300)
Unvested at end of period (in shares)	1,663,300	1,379,400	1,902,000.0	1,495,700	1,663,300	1,902,000.0	1,627,700	1,819,100
Share-based Payment activity, additional disclosures [Abstract]
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 134.84	$ 137.42	$ 144.71	$ 141.51	$ 137.42	$ 141.51	$ 141.51
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	186.21		113.67		179.95	118.66
Weighted average grant date fair value, vested (in dollars per share)	142.07		118.91		150.45	136.36
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	123.85		143.09		138.47	140.22
Weighted average grant date fair value, end of period (in dollars per share)	$ 144.01	$ 134.84	$ 137.93	$ 144.71	$ 144.01	$ 137.93	$ 137.42	$ 141.51
Weighted average remaining contractual life, unvested shares outstanding	1 year 11 months 1 day	1 year 8 months 12 days	2 years 3 days	1 year 9 months 10 days	1 year 11 months 1 day	2 years 3 days	1 year 8 months 8 days	2 years 4 months 20 days
Unamortized deferred compensation cost	$ 104.0				$ 104.0
HFF Acquisition [Member] | Share-based Payment Arrangement [Member]
Share-based Payment activity, additional disclosures [Abstract]
Unamortized deferred compensation cost	$ 16.7				$ 16.7

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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