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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units (RSUs)
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,096,200	1,532,300	1,532,300
Granted (in shares)	56,600	9,700
Vested (in shares)	(207,500)	(324,600)
Forfeited (in shares)	(5,000.0)	(8,500)
Unvested at end of period (in shares)	940,300	1,208,900	1,096,200	1,532,300
Performance Shares [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	531,500	286,800	286,800
Granted (in shares)	0	0
Vested (in shares)	(79,000.0)	0
Forfeited (in shares)	(13,400)	0
Unvested at end of period (in shares)	439,100	286,800	531,500	286,800
Share-based Payment Arrangement [Member]
Share-based Payment activity [Roll Forward]
Unvested at beginning of period (in shares)	1,627,700	1,819,100	1,819,100
Granted (in shares)	56,600	9,700
Vested (in shares)	(286,500)	(324,600)
Forfeited (in shares)	(18,400)	(8,500)
Unvested at end of period (in shares)	1,379,400	1,495,700	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)	$ 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	145.93	160.03
Weighted average grant date fair value, vested (in dollars per share)	150.76	136.91
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	149.11	137.68
Weighted average grant date fair value, end of period (in dollars per share)	$ 134.84	$ 144.71	$ 137.42	$ 141.51
Weighted average remaining contractual life, unvested shares outstanding	1 year 8 months 12 days	1 year 9 months 10 days	1 year 8 months 8 days	2 years 4 months 20 days
Unamortized deferred compensation cost	$ 74.2
HFF Acquisition [Member] | Share-based Payment Arrangement [Member]
Share-based Payment activity, additional disclosures [Abstract]
Unamortized deferred compensation cost	$ 24.1

X

- Definition

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

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