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Property and Equipment (including Concession Assets)
6 Months Ended
Jun. 30, 2012
Property, Plant and Equipment [Abstract]  
Property and Equipment (including Concession Assets)
Property and Equipment (including Concession Assets)
Property and equipment, including concession assets, and related accumulated depreciation and amortization are summarized below (in millions): 
 
June 30,
2012
 
December 31,
2011
Land
$
208.1

 
$
207.4

Concession land rights
141.2

 
141.2

Road property
5,399.6

 
5,326.0

Equipment
857.8

 
833.7

Technology and other
122.4

 
123.3

Construction in progress
209.9

 
153.1

Total property
6,939.0

 
6,784.7

Accumulated depreciation and amortization
1,459.9

 
1,435.2

Property and equipment (including concession assets), net
$
5,479.1

 
$
5,349.5


Concession assets, net of accumulated amortization of $372.5 million and $347.1 million, totaled $1,872.9 million and $1,855.1 million at June 30, 2012 and December 31, 2011, respectively.