Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions		Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Loss		Total World Fuel Shareholders' Equity		Noncontrolling Interest Equity		Total
Balance at Dec. 31, 2014	[1]	$ 0.7	$ 496.4	$ 1,412.0	$ (59.2)		$ 1,849.9		$ 9.5		$ 1,859.4
Balance (in shares) at Dec. 31, 2014	[1]	72.1
Increase (Decrease) in Shareholders' Equity
Net income (loss)	[1]			80.9			80.9		(2.6)		78.3
Cash dividends declared	[1]			(8.5)			(8.5)				(8.5)
Amortization of share-based payment awards	[1]		8.1				8.1				8.1
Issuance of common stock related to share-based payment awards, including income tax benefit of $1.5 for the six months ended June 30, 2015	[1]		1.5				1.5				1.5
Issuance of common stock related to share-based payment awards (in shares)	[1]	0.3
Purchases of common stock tendered by employees to satisfy the required withholding taxes related to share-based payment awards	[1]		(7.0)				(7.0)				(7.0)
Purchases of common stock tendered by employees to satisfy the required withholding taxes related to share-based payment awards (in shares)	[1]	(0.1)
Purchases of common stock	[1]		(30.0)				(30.0)				(30.0)
Purchases of common stock (in shares)	[1]	(0.5)
Other comprehensive (loss) income	[1]				(13.1)		(13.1)		2.5		(10.6)
Other	[1]		(0.1)				(0.1)		0.1
Balance at Jun. 30, 2015	[1]	$ 0.7	468.9	1,484.4	(72.3)		1,881.7		9.5		1,891.2
Balance (in shares) at Jun. 30, 2015	[1]	71.8
Balance at Dec. 31, 2015	[1]	$ 0.7	435.3	1,569.4	(109.5)		1,895.9		10.0		$ 1,905.9
Balance (in shares) at Dec. 31, 2015	[1]	70.8									70.8
Increase (Decrease) in Shareholders' Equity
Net income (loss)	[1]			81.6			81.6		(0.3)		$ 81.3
Cash dividends declared	[1]			(8.3)			(8.3)				(8.3)
Distribution of noncontrolling interest	[1]								(0.2)		(0.2)
Amortization of share-based payment awards	[1]		8.9				8.9				8.9
Issuance of common stock related to share-based payment awards (in shares)	[1]	0.1
Purchases of common stock tendered by employees to satisfy the required withholding taxes related to share-based payment awards	[1]		(3.9)				(3.9)				(3.9)
Purchases of common stock tendered by employees to satisfy the required withholding taxes related to share-based payment awards (in shares)	[1]	(0.1)
Acquisition of remaining 49% equity interest	[1],[2]		(10.9)				(10.9)		7.2		(3.7)
Purchases of common stock	[1]		(18.4)				(18.4)				(18.4)
Purchases of common stock (in shares)	[1]	(0.4)
Other comprehensive (loss) income					(9.1)	[1]	(9.1)	[1]	0.8	[1]	(8.3)	[3]
Balance at Jun. 30, 2016	[1]	$ 0.7	$ 411.0	$ 1,642.7	$ (118.6)		$ 1,935.8		$ 17.5		$ 1,953.3
Balance (in shares) at Jun. 30, 2016	[1]	70.4									70.4

[1] Amounts may not add due to rounding

[2] Relates to Tobras. See Note 3. Acquisitions, Asset and Liabilities Held for Sale.

[3] Amounts may not add due to rounding