Quarterly Results of Operations (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

JONES LANG LASALLE INCORPORATED QUARTERLY INFORMATION - 2016 (UNAUDITED)

	Quarter Ended					Year Ended
($ in millions, except per share data)	March 31, 2016		June 30, 2016	September 30, 2016	December 31, 2016	December 31, 2016
Revenue:
Real Estate Services:
Americas	$	603.5	672.9	771.1	918.4	2,965.9
EMEA	369.4		481.3	522.7	704.1	2,077.5
Asia Pacific	263.4		322.4	331.1	435.7	1,352.6
LaSalle Investment Management	100.5		127.0	80.3	100.0	407.8
Total revenue	1,336.8		1,603.6	1,705.2	2,158.2	6,803.8
Operating expenses:
Real Estate Services:
Americas	573.5		625.8	709.8	796.1	2,705.2
EMEA	381.3		461.3	519.6	636.2	1,998.4
Asia Pacific	265.6		304.0	314.4	382.2	1,266.2
LaSalle Investment Management	79.4		88.3	72.4	84.8	324.9
Plus:
Restructuring charges	7.6		10.3	18.0	32.6	68.5
Total operating expenses	1,307.4		1,489.7	1,634.2	1,931.9	6,363.2
Operating income	29.4		113.9	71.0	226.3	440.6
Net income attributable to common shareholders	$	25.7	78.8	48.0	165.3	317.8
Basic earnings per common share (1)	$	0.57	1.75	1.06	3.66	7.04
Diluted earnings per common share (1)	$	0.56	1.73	1.05	3.62	6.98

(1) Earnings per common share amounts are individually calculated for each quarter as well as the full annual period. As a result, quarterly earnings per common share do not sum to the total for the full year.

JONES LANG LASALLE INCORPORATED QUARTERLY INFORMATION - 2015 (UNAUDITED)

	Quarter Ended					Year Ended
($ in millions, except per share data)	March 31, 2015		June 30, 2015	September 30, 2015	December 31, 2015	December 31, 2015
Revenue:
Real Estate Services:
Americas	$	554.2	597.5	639.4	814.5	2,605.6
EMEA	325.8		416.3	447.0	613.9	1,803.0
Asia Pacific	237.8		279.6	280.7	362.0	1,160.1
LaSalle Investment Management	85.7		80.1	134.2	97.0	397.0
Total revenue	1,203.5		1,373.5	1,501.3	1,887.4	5,965.7
Operating expenses:
Real Estate Services:
Americas	519.1		552.0	582.3	706.9	2,360.3
EMEA	328.3		385.2	420.6	524.3	1,658.4
Asia Pacific	233.3		263.5	268.0	308.8	1,073.6
LaSalle Investment Management	69.3		68.0	92.0	80.2	309.5
Plus:
Restructuring charges	0.8		1.8	18.1	13.4	34.1
Total operating expenses	1,150.8		1,270.5	1,381.0	1,633.6	5,435.9
Operating income	52.7		103.0	120.3	253.8	529.8
Net income attributable to common shareholders	$	41.9	90.1	110.5	195.9	438.4
Basic earnings per common share (1)	$	0.93	2.01	2.45	4.35	9.75
Diluted earnings per common share (1)	$	0.92	1.98	2.43	4.31	9.65

(1) Earnings per common share amounts are individually calculated for each quarter as well as the full annual period. As a result, quarterly earnings per common share do not sum to the total for the full year.