Condensed Consolidating Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Current assets	$ 691.7	$ 942.4
Investments	40.8	41.1
Investments in consolidated subsidiaries	0	0
Restricted funds	0	4.2
Property and equipment (including concession assets), net	6,540.9	6,356.3
Other assets	87.6	91.4
Total assets	7,361.0	7,435.4
Liabilities and equity:
Current liabilities	574.3	730.6
Long-term debt	1,857.3	1,856.9
Deferred income taxes	1,067.4	1,044.6
Other liabilities	122.7	126.7
Stockholders' equity	3,433.0	3,370.6
Noncontrolling interest	306.3	306.0
Total liabilities and equity	7,361.0	7,435.4
Parent [Member]
Assets:
Current assets	2.9	2.6
Investments	0	0
Investments in consolidated subsidiaries	2,243.4	2,154.6
Restricted funds		0
Property and equipment (including concession assets), net	0	0.1
Other assets	1.5	1.5
Total assets	2,247.8	2,158.8
Liabilities and equity:
Current liabilities	(1,194.6)	(1,216.5)
Long-term debt	0.2	0.2
Deferred income taxes	(3.5)	(11.7)
Other liabilities	3.1	6.6
Stockholders' equity	3,442.6	3,380.2
Noncontrolling interest	0	0
Total liabilities and equity	2,247.8	2,158.8
KCSR [Member]
Assets:
Current assets	248.1	403.0
Investments	4.0	9.6
Investments in consolidated subsidiaries	(2.4)	(2.1)
Restricted funds		0
Property and equipment (including concession assets), net	2,856.9	2,780.4
Other assets	48.2	50.9
Total assets	3,154.8	3,241.8
Liabilities and equity:
Current liabilities	1,466.4	1,580.6
Long-term debt	703.5	704.3
Deferred income taxes	727.0	719.8
Other liabilities	92.0	92.0
Stockholders' equity	165.9	145.1
Noncontrolling interest	0	0
Total liabilities and equity	3,154.8	3,241.8
Guarantor Subsidiaries [Member]
Assets:
Current assets	8.4	8.8
Investments	0	0
Investments in consolidated subsidiaries	462.8	461.8
Restricted funds		0
Property and equipment (including concession assets), net	197.2	198.6
Other assets	0	0
Total assets	668.4	669.2
Liabilities and equity:
Current liabilities	127.8	130.7
Long-term debt	0.2	0.2
Deferred income taxes	128.2	127.6
Other liabilities	0.7	0.7
Stockholders' equity	105.2	104.0
Noncontrolling interest	306.3	306.0
Total liabilities and equity	668.4	669.2
Non-Guarantor Subsidiaries [Member]
Assets:
Current assets	452.7	560.1
Investments	36.8	31.5
Investments in consolidated subsidiaries	0	0
Restricted funds		4.2
Property and equipment (including concession assets), net	3,486.8	3,377.2
Other assets	37.9	39.0
Total assets	4,014.2	4,012.0
Liabilities and equity:
Current liabilities	195.1	267.9
Long-term debt	1,153.4	1,152.2
Deferred income taxes	215.7	208.9
Other liabilities	26.9	27.5
Stockholders' equity	2,423.1	2,355.5
Noncontrolling interest	0	0
Total liabilities and equity	4,014.2	4,012.0
Consolidating Adjustments [Member]
Assets:
Current assets	(20.4)	(32.1)
Investments	0	0
Investments in consolidated subsidiaries	(2,703.8)	(2,614.3)
Restricted funds		0
Property and equipment (including concession assets), net	0	0
Other assets	0	0
Total assets	(2,724.2)	(2,646.4)
Liabilities and equity:
Current liabilities	(20.4)	(32.1)
Long-term debt	0	0
Deferred income taxes	0	0
Other liabilities	0	(0.1)
Stockholders' equity	(2,703.8)	(2,614.2)
Noncontrolling interest	0	0
Total liabilities and equity	$ (2,724.2)	$ (2,646.4)