Geographic Information (Information by Geographic Area) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Segments	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable business segments of the Company | Segments			1
Revenues	$ 656.6	$ 604.5	$ 1,922.5	$ 1,735.7
Property and equipment (including concession assets), net	8,335.6		8,335.6		$ 8,069.7
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	345.9	317.4	1,011.5	896.4
Property and equipment (including concession assets), net	5,185.9		5,185.9		4,960.6
MEXICO
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	310.7	$ 287.1	911.0	$ 839.3
Property and equipment (including concession assets), net	$ 3,149.7		$ 3,149.7		$ 3,109.1