Geographic Information (Information by Geographic Area) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 607.4	$ 552.8
Property and equipment (including concession assets), net	6,540.9		6,356.3
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	325.1	297.5
Property and equipment (including concession assets), net	3,756.6		3,662.2
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	282.3	255.3
Property and equipment (including concession assets), net	$ 2,784.3		$ 2,694.1