Condensed Consolidating Statements of Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Statements of Comprehensive Income Captions [Line Items]
Revenues	$ 642.5	$ 677.5	$ 649.7		$ 607.4		$ 615.6	$ 621.6	$ 579.3		$ 552.8	$ 2,577.1	$ 2,369.3	$ 2,238.6
Operating expenses												1,768.0	1,630.7	1,522.7
Operating income	213.9	229.4	205.8	[1]	160.0	[2]	196.1	200.3	179.3		162.9	809.1	738.6	715.9
Equity in net earnings of unconsolidated affiliates												21.1	18.8	19.3
Interest expense												(72.8)	(80.6)	(100.4)
Debt retirement costs									(111.4)			(6.6)	(119.2)	(20.1)
Foreign exchange gain (loss)												(35.5)	(5.2)	2.7
Other expense, net												(2.2)	(0.8)	(1.0)
Income before income taxes												713.1	551.6	616.4
Income tax expense (benefit)												208.8	198.3	237.0
Net income	141.7	138.4	130.2		94.0		114.4	119.0	15.7	[3]	104.2	504.3	353.3	379.4
Less: Net income attributable to noncontrolling interest												1.7	1.9	2.1
Net income attributable to Kansas City Southern and subsidiaries	141.0	138.1	129.8		93.7		113.8	118.4	15.4	[3]	103.8	502.6	351.4	377.3
Other comprehensive income (loss)												(1.2)	0.4	(0.2)
Comprehensive income attributable to Kansas City Southern and subsidiaries												501.4	351.8	377.1
Parent [Member]
Condensed Statements of Comprehensive Income Captions [Line Items]
Revenues												0	0	0
Operating expenses												7.6	4.8	4.2
Operating income												(7.6)	(4.8)	(4.2)
Equity in net earnings of unconsolidated affiliates												476.7	318.3	218.9
Interest expense												(0.1)	(0.1)	(0.1)
Debt retirement costs												0	0	0
Foreign exchange gain (loss)												0	0	0
Other expense, net												50.1	44.6	46.5
Income before income taxes												519.1	358.0	261.1
Income tax expense (benefit)												16.5	17.6	8.4
Net income												502.6	340.4	252.7
Less: Net income attributable to noncontrolling interest												0	0	0
Net income attributable to Kansas City Southern and subsidiaries												502.6	340.4	252.7
Other comprehensive income (loss)												(1.2)	0.4	(0.2)
Comprehensive income attributable to Kansas City Southern and subsidiaries												501.4	340.8	252.5
KCSR [Member]
Condensed Statements of Comprehensive Income Captions [Line Items]
Revenues												1,215.8	1,115.0	1,079.7
Operating expenses												881.6	829.6	805.0
Operating income												334.2	285.4	274.7
Equity in net earnings of unconsolidated affiliates												(0.1)	1.1	2.6
Interest expense												(83.3)	(68.5)	(65.0)
Debt retirement costs												(2.7)	(1.5)	(19.6)
Foreign exchange gain (loss)												0	(1.3)	0
Other expense, net												0.2	5.1	11.7
Income before income taxes												248.3	220.3	204.4
Income tax expense (benefit)												94.7	81.2	74.4
Net income												153.6	139.1	130.0
Less: Net income attributable to noncontrolling interest												0	0	0
Net income attributable to Kansas City Southern and subsidiaries												153.6	139.1	130.0
Other comprehensive income (loss)												0.1	0.5	(0.6)
Comprehensive income attributable to Kansas City Southern and subsidiaries												153.7	139.6	129.4
Guarantor Subsidiaries [Member]
Condensed Statements of Comprehensive Income Captions [Line Items]
Revenues												48.7	42.6	29.9
Operating expenses												41.8	39.0	34.0
Operating income												6.9	3.6	(4.1)
Equity in net earnings of unconsolidated affiliates												5.5	6.3	6.6
Interest expense												0	0.1	0
Debt retirement costs												0	0	0
Foreign exchange gain (loss)												0	0	0
Other expense, net												0	(0.1)	0
Income before income taxes												12.4	9.9	2.5
Income tax expense (benefit)												4.4	2.9	(0.2)
Net income												8.0	7.0	2.7
Less: Net income attributable to noncontrolling interest												1.7	1.9	2.1
Net income attributable to Kansas City Southern and subsidiaries												6.3	5.1	0.6
Other comprehensive income (loss)												0	0	0
Comprehensive income attributable to Kansas City Southern and subsidiaries												6.3	5.1	0.6
Non-Guarantor Subsidiaries [Member]
Condensed Statements of Comprehensive Income Captions [Line Items]
Revenues												1,353.7	1,251.9	1,164.7
Operating expenses												879.1	800.1	717.7
Operating income												474.6	451.8	447.0
Equity in net earnings of unconsolidated affiliates												18.9	15.7	15.5
Interest expense												(39.6)	(59.3)	(88.2)
Debt retirement costs												(3.9)	(117.7)	(0.5)
Foreign exchange gain (loss)												(35.5)	(3.9)	2.7
Other expense, net												(1.2)	(0.6)	(128.5)
Income before income taxes												413.3	286.0	248.0
Income tax expense (benefit)												93.2	96.6	154.4
Net income												320.1	189.4	93.6
Less: Net income attributable to noncontrolling interest												0	0	0
Net income attributable to Kansas City Southern and subsidiaries												320.1	189.4	93.6
Other comprehensive income (loss)												(1.8)	(0.1)	0.9
Comprehensive income attributable to Kansas City Southern and subsidiaries												318.3	189.3	94.5
Consolidating Adjustments [Member]
Condensed Statements of Comprehensive Income Captions [Line Items]
Revenues												(41.1)	(40.2)	(35.7)
Operating expenses												(42.1)	(42.8)	(38.2)
Operating income												1.0	2.6	2.5
Equity in net earnings of unconsolidated affiliates												(479.9)	(322.6)	(224.3)
Interest expense												50.2	47.2	52.9
Debt retirement costs												0	0	0
Foreign exchange gain (loss)												0	0	0
Other expense, net												(51.3)	(49.8)	69.3
Income before income taxes												(480.0)	(322.6)	(99.6)
Income tax expense (benefit)												0	0	0
Net income												(480.0)	(322.6)	(99.6)
Less: Net income attributable to noncontrolling interest												0	0	0
Net income attributable to Kansas City Southern and subsidiaries												(480.0)	(322.6)	(99.6)
Other comprehensive income (loss)												1.7	(0.4)	(0.3)
Comprehensive income attributable to Kansas City Southern and subsidiaries												$ (478.3)	$ (323.0)	$ (99.9)

[1] During the second quarter of 2014, the Company recognized pre-tax lease termination costs of $8.4 million, due to the early termination of certain operating leases and the related purchase of equipment.

[2] During the first quarter of 2014, the Company recognized pre-tax lease termination costs of $29.9 million, due to the early termination of certain operating leases and the related purchase of equipment.

[3] During the second quarter of 2013, the Company recognized pre-tax debt retirement costs of $111.4 million, related to debt restructuring activities that occurred during the period.