Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Condensed Income Statements, Captions [Line Items]
Revenues	$ 649.7	$ 579.3	$ 1,257.1	$ 1,132.1
Operating expenses	443.9	400.0	891.3	789.9
Operating income	205.8	179.3	365.8	342.2
Equity in net earnings of unconsolidated affiliates	5.9	3.5	11.6	9.0
Interest expense	(17.9)	(19.2)	(36.6)	(42.9)
Debt retirement costs	0	(111.4)	(6.6)	(111.4)
Foreign exchange gain (loss)	5.3	(22.2)	8.4	(8.7)
Other income (expense), net	(2.8)	(0.1)	(3.3)	0.2
Income before income taxes	196.3	29.9	339.3	188.4
Income tax expense (benefit)	66.1	14.2	115.1	68.5
Net income	130.2	15.7	224.2	119.9
Less: Net income attributable to noncontrolling interest	0.4	0.3	0.7	0.7
Net income attributable to Kansas City Southern and subsidiaries	129.8	15.4	223.5	119.2
Other comprehensive income (loss)	0	(0.3)	0	0.3
Comprehensive income attributable to Kansas City Southern and subsidiaries	129.8	15.1	223.5	119.5
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	0	0	0	0
Operating expenses	4.2	1.7	5.1	2.6
Operating income	(4.2)	(1.7)	(5.1)	(2.6)
Equity in net earnings of unconsolidated affiliates	127.0	8.1	215.5	107.9
Interest expense	0	0	0	0
Debt retirement costs	0	0	0	0
Foreign exchange gain (loss)	0	0	0	0
Other income (expense), net	12.5	11.1	25.5	22.4
Income before income taxes	135.3	17.5	235.9	127.7
Income tax expense (benefit)	5.5	2.1	12.4	8.5
Net income	129.8	15.4	223.5	119.2
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Kansas City Southern and subsidiaries	129.8	15.4	223.5	119.2
Other comprehensive income (loss)	0	(0.3)	0	0.3
Comprehensive income attributable to Kansas City Southern and subsidiaries	129.8	15.1	223.5	119.5
KCSR [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	302.3	275.7	586.3	540.2
Operating expenses	219.3	203.3	446.2	405.5
Operating income	83.0	72.4	140.1	134.7
Equity in net earnings of unconsolidated affiliates	0.3	0.8	0.6	1.2
Interest expense	(20.8)	(16.9)	(42.3)	(31.6)
Debt retirement costs	0	(1.5)	(2.7)	(1.5)
Foreign exchange gain (loss)	0	(1.6)	0	(1.6)
Other income (expense), net	0	1.5	0.4	3.2
Income before income taxes	62.5	54.7	96.1	104.4
Income tax expense (benefit)	23.9	20.8	36.9	38.2
Net income	38.6	33.9	59.2	66.2
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Kansas City Southern and subsidiaries	38.6	33.9	59.2	66.2
Other comprehensive income (loss)	0.1	0.3	0.1	0.4
Comprehensive income attributable to Kansas City Southern and subsidiaries	38.7	34.2	59.3	66.6
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	12.3	11.5	23.7	20.2
Operating expenses	10.1	9.3	20.0	18.6
Operating income	2.2	2.2	3.7	1.6
Equity in net earnings of unconsolidated affiliates	1.1	0.9	2.1	2.2
Interest expense	0	0	0	0
Debt retirement costs	0	0	0	0
Foreign exchange gain (loss)	0	0	0	0
Other income (expense), net	0	(0.1)	0	(0.1)
Income before income taxes	3.3	3.0	5.8	3.7
Income tax expense (benefit)	1.3	1.1	2.2	1.4
Net income	2.0	1.9	3.6	2.3
Less: Net income attributable to noncontrolling interest	0.4	0.3	0.7	0.7
Net income attributable to Kansas City Southern and subsidiaries	1.6	1.6	2.9	1.6
Other comprehensive income (loss)	0	0	0	0
Comprehensive income attributable to Kansas City Southern and subsidiaries	1.6	1.6	2.9	1.6
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	345.4	302.8	667.3	591.5
Operating expenses	221.1	197.0	441.3	384.2
Operating income	124.3	105.8	226.0	207.3
Equity in net earnings of unconsolidated affiliates	5.5	2.9	10.5	6.9
Interest expense	(9.7)	(14.1)	(19.9)	(35.1)
Debt retirement costs	0	(109.9)	(3.9)	(109.9)
Foreign exchange gain (loss)	5.3	(20.6)	8.4	(7.1)
Other income (expense), net	(2.3)	(0.2)	(2.5)	(0.2)
Income before income taxes	123.1	(36.1)	218.6	61.9
Income tax expense (benefit)	35.4	(9.8)	63.6	20.4
Net income	87.7	(26.3)	155.0	41.5
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Kansas City Southern and subsidiaries	87.7	(26.3)	155.0	41.5
Other comprehensive income (loss)	0.1	(0.7)	0.1	0
Comprehensive income attributable to Kansas City Southern and subsidiaries	87.8	(27.0)	155.1	41.5
Consolidating Adjustments [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	(10.3)	(10.7)	(20.2)	(19.8)
Operating expenses	(10.8)	(11.3)	(21.3)	(21.0)
Operating income	0.5	0.6	1.1	1.2
Equity in net earnings of unconsolidated affiliates	(128.0)	(9.2)	(217.1)	(109.2)
Interest expense	12.6	11.8	25.6	23.8
Debt retirement costs	0	0	0	0
Foreign exchange gain (loss)	0	0	0	0
Other income (expense), net	(13.0)	(12.4)	(26.7)	(25.1)
Income before income taxes	(127.9)	(9.2)	(217.1)	(109.3)
Income tax expense (benefit)	0	0	0	0
Net income	(127.9)	(9.2)	(217.1)	(109.3)
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Kansas City Southern and subsidiaries	(127.9)	(9.2)	(217.1)	(109.3)
Other comprehensive income (loss)	(0.2)	0.4	(0.2)	(0.4)
Comprehensive income attributable to Kansas City Southern and subsidiaries	$ (128.1)	$ (8.8)	$ (217.3)	$ (109.7)