Correction of Previously Issued Financial Information - Consolidated Statements of Income and Comprehensive Income (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended	2 Months Ended	3 Months Ended				6 Months Ended
		May 31, 2016	May 31, 2016	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Revenue				$ 6,633.0	[1]	$ 8,496.4	[2]	$ 11,823.9	[1]	$ 15,837.1	[2]
Cost of revenue				6,414.5	[1]	8,306.0	[2]	11,383.9	[1]	15,433.1	[2]
Gross profit				218.5	[1]	190.4	[2]	440.0	[1]	404.0	[2]
Operating expenses:
Compensation and employee benefits				103.7	[1]	87.5	[2]	199.6	[1]	176.2	[2]
Provision for bad debt				2.5	[1]	2.3	[2]	3.9	[1]	3.6	[1]
General and administrative				66.8	[1]	59.0	[2]	129.9	[1]	115.0	[2]
Total operating expenses				173.0	[1]	148.8	[2]	333.4	[1]	294.8	[2]
Income from operations				45.6	[1]	41.6	[2]	106.6	[1]	109.2	[2]
Non-operating expenses, net:
Interest expense and other financing costs, net	[3]			(8.1)		(6.4)		(15.7)		(13.7)
Other income (expense), net				(0.6)	[1]	(1.6)	[2]	0.7	[1]	(1.3)	[2]
Total non-operating expenses, net				(8.7)	[1]	(8.0)	[2]	(15.0)	[1]	(15.0)	[2]
Income before income taxes				36.9	[1]	33.6	[2]	91.6	[1]	94.2	[2]
Provision for income taxes				7.1	[1]	4.6	[2]	10.3	[1]	15.9	[2]
Net income including noncontrolling interest				29.8	[1]	29.0	[2]	81.3	[1]	78.3	[1]
Net loss attributable to noncontrolling interest				(0.2)	[1]	(1.5)	[2]	(0.3)	[1]	(2.6)	[2]
Net income attributable to World Fuel	[3]			$ 30.0		$ 30.5		$ 81.6		$ 80.9
Basic earnings per common share (in dollars per share)	[3]			$ 0.43		$ 0.43		$ 1.17		$ 1.14
Basic weighted average common shares (in shares)	[3]			69.5		70.7		69.5		70.7
Diluted earnings per common share (in dollars per share)	[3]			$ 0.43		$ 0.43		$ 1.17		$ 1.13
Diluted weighted average common shares (in shares)	[3]			70.0		71.2		70.0		71.3
Comprehensive income:
Net income including noncontrolling interest				$ 29.8	[1]	$ 29.0	[2]	$ 81.3	[1]	$ 78.3	[1]
Other comprehensive income (loss):
Foreign currency translation adjustments				(14.5)	[1]	21.4	[2]	(13.2)	[1]	(10.6)	[2]
Other comprehensive (loss) income				(9.3)	[1]	21.4	[2]	(8.3)	[3]	(10.6)	[1]
Comprehensive income including noncontrolling interest				20.5	[1]	50.4	[2]	73.0	[1]	67.7	[2]
Comprehensive (loss) income attributable to noncontrolling interest				(1.0)	[1]	(1.2)	[2]	0.5	[1]	(0.1)	[2]
Comprehensive income attributable to World Fuel				$ 21.5	[1]	51.6	[2]	$ 72.5	[1]	67.8	[2]
As Reported
Revenue	[2]					8,496.4				15,837.1
Cost of revenue	[2]					8,306.0				15,431.3
Gross profit	[2]					190.4				405.8
Operating expenses:
Compensation and employee benefits	[2]					87.5				176.2
Provision for bad debt	[2]					2.3				3.6
General and administrative	[2]					59.0				113.0
Total operating expenses	[2]					148.8				292.8
Income from operations	[2]					41.6				113.0
Non-operating expenses, net:
Interest expense and other financing costs, net	[2]					(6.4)				(13.7)
Other income (expense), net	[2]					(1.6)				(1.3)
Total non-operating expenses, net	[2]					(8.0)				(15.0)
Income before income taxes	[2]					33.6				98.0
Provision for income taxes	[2]					5.2				15.1
Net income including noncontrolling interest	[2]					28.4				82.9
Net loss attributable to noncontrolling interest	[2]					(1.5)				(2.6)
Net income attributable to World Fuel	[2]					$ 29.9				$ 85.5
Basic earnings per common share (in dollars per share)	[2]					$ 0.42				$ 1.21
Basic weighted average common shares (in shares)	[2]					70.7				70.7
Diluted earnings per common share (in dollars per share)	[2]					$ 0.42				$ 1.20
Diluted weighted average common shares (in shares)	[2]					71.2				71.3
Comprehensive income:
Net income including noncontrolling interest	[2]					$ 28.4				$ 82.9
Other comprehensive income (loss):
Foreign currency translation adjustments	[2]					22.0				(11.8)
Other comprehensive (loss) income	[2]					22.0				(11.8)
Comprehensive income including noncontrolling interest	[2]					50.4				71.1
Comprehensive (loss) income attributable to noncontrolling interest	[2]					(1.2)				(0.1)
Comprehensive income attributable to World Fuel	[2]					$ 51.6				$ 71.2
Adjustment
Cost of revenue	[2]		$ 1.8
Gross profit	[2]		(1.8)
Operating expenses:
General and administrative	[2]		2.0
Total operating expenses	[2]		2.0
Income from operations	[2]		(3.8)
Non-operating expenses, net:
Income before income taxes	[2]		(3.8)
Provision for income taxes	[2]	$ (0.6)	0.8
Net income including noncontrolling interest	[2]	0.6	(4.6)
Net income attributable to World Fuel	[2]	$ 0.6	$ (4.6)
Basic earnings per common share (in dollars per share)	[2]	$ 0.01	$ (0.07)
Diluted earnings per common share (in dollars per share)	[2]	$ 0.01	$ (0.06)
Comprehensive income:
Net income including noncontrolling interest	[2]	$ 0.6	$ (4.6)
Other comprehensive income (loss):
Foreign currency translation adjustments	[2]	(0.6)	1.2
Other comprehensive (loss) income	[2]	$ (0.6)	1.2
Comprehensive income including noncontrolling interest	[2]		(3.4)
Comprehensive income attributable to World Fuel	[2]		$ (3.4)

[1] Amounts may not add due to rounding

[2] Amounts may not add due to rounding

[3] Amounts may not add due to rounding