Condensed Consolidating Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Current assets	$ 708.2	$ 942.4
Investments	38.9	41.1
Investments in consolidated subsidiaries	0	0
Restricted funds	0	4.2
Property and equipment (including concession assets), net	6,825.8	6,356.3
Other assets	77.8	91.4
Total assets	7,650.7	7,435.4
Liabilities and equity:
Current liabilities	729.0	730.6
Long-term debt	1,852.4	1,856.9
Deferred income taxes	1,097.9	1,044.6
Other liabilities	129.6	126.7
Stockholders' equity	3,535.1	3,370.6
Noncontrolling interest	306.7	306.0
Total liabilities and equity	7,650.7	7,435.4
Parent [Member]
Assets:
Current assets	3.8	2.6
Investments	0	0
Investments in consolidated subsidiaries	2,365.1	2,154.6
Restricted funds		0
Property and equipment (including concession assets), net	0	0.1
Other assets	1.6	1.5
Total assets	2,370.5	2,158.8
Liabilities and equity:
Current liabilities	(1,180.6)	(1,216.5)
Long-term debt	0.2	0.2
Deferred income taxes	2.9	(11.7)
Other liabilities	3.3	6.6
Stockholders' equity	3,544.7	3,380.2
Noncontrolling interest	0	0
Total liabilities and equity	2,370.5	2,158.8
KCSR [Member]
Assets:
Current assets	218.8	403.0
Investments	3.9	9.6
Investments in consolidated subsidiaries	(2.7)	(2.1)
Restricted funds		0
Property and equipment (including concession assets), net	3,099.4	2,780.4
Other assets	39.1	50.9
Total assets	3,358.5	3,241.8
Liabilities and equity:
Current liabilities	1,605.9	1,580.6
Long-term debt	702.7	704.3
Deferred income taxes	746.6	719.8
Other liabilities	98.8	92.0
Stockholders' equity	204.5	145.1
Noncontrolling interest	0	0
Total liabilities and equity	3,358.5	3,241.8
Guarantor Subsidiaries [Member]
Assets:
Current assets	5.9	8.8
Investments	0	0
Investments in consolidated subsidiaries	464.3	461.8
Restricted funds		0
Property and equipment (including concession assets), net	195.6	198.6
Other assets	0	0
Total assets	665.8	669.2
Liabilities and equity:
Current liabilities	121.6	130.7
Long-term debt	0.2	0.2
Deferred income taxes	129.3	127.6
Other liabilities	0.6	0.7
Stockholders' equity	107.4	104.0
Noncontrolling interest	306.7	306.0
Total liabilities and equity	665.8	669.2
Non-Guarantor Subsidiaries [Member]
Assets:
Current assets	493.0	560.1
Investments	35.0	31.5
Investments in consolidated subsidiaries	0	0
Restricted funds		4.2
Property and equipment (including concession assets), net	3,530.8	3,377.2
Other assets	37.1	39.0
Total assets	4,095.9	4,012.0
Liabilities and equity:
Current liabilities	195.4	267.9
Long-term debt	1,149.3	1,152.2
Deferred income taxes	219.1	208.9
Other liabilities	26.9	27.5
Stockholders' equity	2,505.2	2,355.5
Noncontrolling interest	0	0
Total liabilities and equity	4,095.9	4,012.0
Consolidating Adjustments [Member]
Assets:
Current assets	(13.3)	(32.1)
Investments	0	0
Investments in consolidated subsidiaries	(2,826.7)	(2,614.3)
Restricted funds		0
Property and equipment (including concession assets), net	0	0
Other assets	0	0
Total assets	(2,840.0)	(2,646.4)
Liabilities and equity:
Current liabilities	(13.3)	(32.1)
Long-term debt	0	0
Deferred income taxes	0	0
Other liabilities	0	(0.1)
Stockholders' equity	(2,826.7)	(2,614.2)
Noncontrolling interest	0	0
Total liabilities and equity	$ (2,840.0)	$ (2,646.4)