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Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Units (RSUs)
Restricted stock unit activity [Roll Forward]
Unvested at beginning of period (in shares)	696,300			727,700	652,700	727,700	727,700
Granted (in shares)	1,130,100		5,800		1,410,300	225,800
Vested (in shares)	(45,800)		(81,200)		(268,300)	(259,300)
Forfeited (in shares)	(8,100)		(35,500)		(22,200)	(54,800)
Unvested at end of period (in shares)	1,772,500	696,300	639,400	750,300	1,772,500	639,400	652,700	727,700
Restricted stock unit activity, additional disclosures [Abstract]
Weighted average grant date fair value, beginning of period (in dollars per share)	$ 144.17			$ 118.96	$ 131.32	$ 118.96	$ 118.96
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	141.14		$ 144.43		149.22	161.87
Weighted average grant date fair value, vested (in dollars per share)	122.48		123.08		116.25	122.63
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	138.96		136.07		134.54	132.64
Weighted average grant date fair value, end of period (in dollars per share)	$ 142.82	$ 144.17	$ 131.93	$ 131.09	$ 142.82	$ 131.93	$ 131.32	$ 118.96
Weighted average remaining contractual life, unvested shares outstanding	2 years 7 months 2 days	2 years 3 months	2 years 2 months 15 days	2 years 4 months 9 days	2 years 7 months 2 days	2 years 2 months 15 days	2 years 7 days	1 year 2 months 26 days
Unamortized deferred compensation cost	$ 157.1				$ 157.1
HFF Acquisition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Granted to Employees in Conjunction with Acquisition					1,111,300
HFF Acquisition [Member] | Restricted Stock Units (RSUs)
Restricted stock unit activity, additional disclosures [Abstract]
Unamortized deferred compensation cost	$ 105.9				$ 105.9

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