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Operating Segments and Related Disclosures (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Operating revenues by geographic region Operating revenues by geographic region as defined by the Department of Transportation ("DOT") area are summarized below:
 
2018
 
2017
 
2016
 
(in millions)
DOT—Domestic
$
2,990.7

 
$
2,432.1

 
$
2,134.4

DOT—Latin America and Caribbean
332.3

 
211.5

 
185.6

Total
$
3,323.0

 
$
2,643.6

 
$
2,320.0