Geographic Information (Information by Geographic Area) (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	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 649.7	$ 579.3	$ 1,257.1	$ 1,132.1
Property and equipment (including concession assets), net	6,825.8		6,825.8		6,356.3
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	344.0	312.6	669.1	610.1
Property and equipment (including concession assets), net	4,014.0		4,014.0		3,662.2
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	305.7	266.7	588.0	522.0
Property and equipment (including concession assets), net	$ 2,811.8		$ 2,811.8		$ 2,694.1