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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, 2021	Sep. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2021	Sep. 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)	1,118,100	1,343,200	1,096,200	1,532,300	1,096,200	1,532,300	1,532,300
Granted (in shares)	23,700	11,200			280,800	173,100
Vested (in shares)	(199,600)	(213,500)			(417,800)	(548,400)
Forfeited (in shares)	(6,900)	(13,000.0)			(23,900)	(29,100)
Unvested at end of period (in shares)	935,300	1,127,900	1,118,100	1,343,200	935,300	1,127,900	1,096,200	1,532,300
Performance Shares [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	545,200	558,800	531,500	286,800	531,500	286,800	286,800
Granted (in shares)	58,800	4,400			166,000.0	276,400
Vested (in shares)	0	0			(79,000.0)	0
Forfeited (in shares)	(9,400)	(4,500)			(23,900)	(4,500)
Unvested at end of period (in shares)	594,600	558,700	545,200	558,800	594,600	558,700	531,500	286,800
Share-based Payment Arrangement [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,663,300	1,902,000	1,627,700	1,819,100	1,627,700	1,819,100	1,819,100
Granted (in shares)	82,500	15,600			446,800	449,500
Vested (in shares)	(199,600)	(213,500)			(496,800)	(548,400)
Forfeited (in shares)	(16,300)	(17,500)			(47,800)	(33,600)
Unvested at end of period (in shares)	1,529,900	1,686,600	1,663,300	1,902,000	1,529,900	1,686,600	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)	$ 144.01	$ 137.93	$ 137.42	$ 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	205.50	107.51			184.71	114.19
Weighted average grant date fair value, vested (in dollars per share)	141.21	140.38			146.76	137.92
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	145.07	134.03			140.66	136.96
Weighted average grant date fair value, end of period (in dollars per share)	$ 147.75	$ 137.49	$ 144.01	$ 137.93	$ 147.75	$ 137.49	$ 137.42	$ 141.51
Weighted average remaining contractual life, unvested shares outstanding			1 year 11 months 1 day	2 years 3 days	1 year 11 months 15 days	1 year 10 months 6 days	1 year 8 months 8 days	2 years 4 months 20 days
Unamortized deferred compensation cost	$ 105.1				$ 105.1
HFF Acquisition [Member] | Share-based Payment Arrangement [Member]
Share-based Payment activity, additional disclosures [Abstract]
Unamortized deferred compensation cost	$ 12.9				$ 12.9

X

- Definition

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

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